From ce588fe7ead48e34bf36292059717ba01b362a92 Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 11:37:16 +0000
Subject: [PATCH 1/7] feat(contest): add ICPC Prelim contest table provider
 (Phase 0-3)

- Add 28 years (1998-2025) of ICPCPrelim seed data to prisma/tasks.ts
- Implement AojIcpcPrelimProvider with per-year instantiation pattern
- Add buildAojIcpcLetterMap util with override map for judge-gap years
- Add titleFontSize optional field to ContestTableMetaData for per-provider font control
- Register AojIcpcPrelimProvider in contest_table_provider_groups
- Add plan.md under docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../2026-06-10/aoj-icpc-prelim-table/plan.md  |  248 ++++
 prisma/tasks.ts                               | 1309 +++++++++++++++++
 .../components/contest-table/TaskTable.svelte |    5 +-
 .../contest-table/contest_table_provider.ts   |    2 +
 .../contest-table/aoj_icpc_labels.test.ts     |   56 +
 .../utils/contest-table/aoj_icpc_labels.ts    |   25 +
 .../contest-table/aoj_icpc_providers.test.ts  |  391 +++++
 .../utils/contest-table/aoj_icpc_providers.ts |   72 +
 .../contest-table/contest_table_provider.ts   |    2 +
 .../contest_table_provider_groups.test.ts     |   16 +
 .../contest_table_provider_groups.ts          |   18 +
 11 files changed, 2143 insertions(+), 1 deletion(-)
 create mode 100644 docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md
 create mode 100644 src/features/tasks/utils/contest-table/aoj_icpc_labels.test.ts
 create mode 100644 src/features/tasks/utils/contest-table/aoj_icpc_labels.ts
 create mode 100644 src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
 create mode 100644 src/features/tasks/utils/contest-table/aoj_icpc_providers.ts

diff --git a/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md b/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md
new file mode 100644
index 000000000..70ca259ff
--- /dev/null
+++ b/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md
@@ -0,0 +1,248 @@
+# ICPC 国内予選テーブル 実装計画 (Issue #3633)
+
+## 概要
+
+Issue #3633「ICPC・国内予選」のテーブルを追加する。`src/lib/utils/contest.ts` の `AOJ_ICPC`（`ICPC_TRANSLATIONS = { Prelim: ' 国内予選 ', ... }`）相当の分類・ラベルは**既に存在**しており、`classifyContest` / `contestTypePriorities`（priority 23）/ `getContestNameLabel` / AOJ URL 生成（`AojGenerator`）まで実装済み。一方で **テーブルプロバイダ（ContestTableProviderGroup）は未実装**で、AOJ 系（PCK/JAG/ICPC/COURSES/UNIVERSITY）の表示テーブルは1つも登録されていない。本タスクは ICPC 国内予選を「最初の AOJ テーブル」として、EDPC（PR #2286）相当の形式で追加する。
+
+スコープは **国内予選のみ**（`ICPCPrelim{year}`、1998〜2025 の28年分）。
+
+### 今回の3つの新規要件（既存実装に前例なし）
+
+1. **年度単位でテーブル分割（新しい年度が上）**: 年度クラスを28個作る代わりに、**1つのベースクラスをコンストラクタで年度指定して28回インスタンス化**する。既存の JOI/Tessoku は「セクションごとにサブクラス」だが、本件は「1クラス × year引数」とする。
+2. **表示ラベルのプレフィックス付与（DB値は不変）**: DB の `task_table_index`（= AOJ 問題ID、例 `1664`）を数値として昇順ソートし、最小を `A`, 次を `B`… に対応付け、表示タイトルを `(問題名)` → `A. (問題名)` に前置変換。ジャッジの欠落で連番にならない年度は **contest_id ごとの上書き Map** で個別対応（Map の中身は後でユーザーが提供）。
+   - **重要**: ICPC の DB タイトルは `"{name}"` のみ（`"{problem_index}. {name}"` ではない）。ICPC はアプリ側からの登録（初期仕様）で title にインデックスが付かなかったため。よって除去処理は不要で、letter を**前置するだけ**でよい（手入力の他 seed データは title にインデックス付きだが、ICPC は別扱い）。
+3. **テーブルタイトルのフォントサイズをこのテーブルだけ小さく**: 現状 `TaskTable.svelte` で `text-2xl` ハードコードのため、**プロバイダ単位で指定可能にする**（このテーブルは `text-xl`）。
+
+## 設計判断と既存資産の再利用
+
+- **ContestType レイヤはスキップ**: `AOJ_ICPC` は schema enum / `ContestType` 定数 / `classifyContest` / `contestTypePriorities` / `getContestNameLabel` / 分類・ラベルのテスト（`AOJ_ICPC_TEST_DATA`）まで完備。skill の Layer 1〜3 は不要。
+- **プロバイダ基盤の再利用**: `ContestTableProviderBase`（`src/features/tasks/utils/contest-table/contest_table_provider_base.ts`）を継承。`constructor(contestType, section?)` の `section` に年度文字列を渡すと provider key が `AOJ_ICPC::2025` となり一意化できる（`createProviderKey` 既存）。
+- **ラベル付与は generateTable をオーバーライドして表示用 title を差し替える方式**（共有コンポーネント無改造）。ICPC の title は `"{name}"` のみなので除去は不要、`{letter}. ` を**前置するだけ**。`isShownTaskIndex: true` でセルは `taskResult.title` をそのまま表示。
+- **letter 割当はピュアな util に切り出してテスト**（coding-style: business logic → utils + adjacent test）。
+- **seed 行の形式**は既存 AOJ/JAG 行に準拠: `{ id, contest_id, problem_index, name, title }`、`grade` 省略 = PENDING。ただし **ICPC は `title = "{name}"`**（problem_index プレフィックスなし。アプリ登録の初期仕様に合わせる）。`problem_index` には AOJ id を入れる。
+
+### 却下した代替案
+
+- **年度ごとにサブクラス（JOI/Tessoku 流）**: 28クラスは冗長。ユーザー要件「ベースクラス1つ + コンストラクタで年度指定」に反する。→ 却下。
+- **セル表示ロジックを `TaskTableBodyCell.svelte` 側に分岐追加**: 共有コンポーネントに ICPC 専用分岐が漏れる。generateTable で表示用 title を生成する方がプロバイダ内に閉じる。→ 却下。
+- **`title` フォントサイズを全テーブル一律変更**: 他テーブルへ影響。→ 却下、プロバイダ単位の任意設定にする。
+- **letter を AOJ API の配列順から決定**: 欠落年度では配列順≠正規レター。`task_table_index` 数値昇順 + 上書き Map の方が DB 単独で完結。→ 数値昇順を採用（ユーザー選択）。
+
+---
+
+## Phase 0: Seed データ収集（ブロッカー・最初に実施）
+
+`prisma/tasks.ts` に ICPC 行が0件。AOJ Judge API から収集して追加する。
+
+- データ源: `https://judgeapi.u-aizu.ac.jp/challenges/cl/icpc/prelim`
+  - `contests[].abbr`（例 `ICPCPrelim2025`）、`contests[].days[].problems[]` に `id`（数値文字列）・`name`。
+- 各 problem を1行に変換（`prisma/tasks.ts` の配列へ追記）:
+  ```js
+  {
+    id: '1664',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1664',  // = AOJ id（DB の task_table_index にマップ）
+    name: '<API の name>',
+    title: '<API の name>', // ICPC は name のみ（index プレフィックスを付けない）
+    // grade 省略 → PENDING
+  }
+  ```
+- 28年分（1998〜2025、各4〜9問、計 ~170行）。
+- 検証: `classifyContest('ICPCPrelim2023') === ContestType.AOJ_ICPC`、`getContestNameLabel` が `（ICPC 国内予選 2023）` 系を返すこと（既存テストの延長で確認可）。
+
+> 注: gap（ジャッジ欠落で A,B,C… が連続しない年度）の特定は Phase 2 の上書き Map 用データとして別途ユーザーが提供。Phase 0 では API が返す問題のみ seed する。
+
+**critical file**: `prisma/tasks.ts`
+
+---
+
+## Phase 1: タイトルフォントサイズのプロバイダ単位設定（低リスク・独立）
+
+- `ContestTableMetaData`（`src/features/tasks/types/contest-table/contest_table_provider.ts`）に任意フィールド追加:
+  ```ts
+  titleFontSize?: string; // Tailwind class, e.g. 'text-xl'. Defaults to 'text-2xl' at render.
+  ```
+- `TaskTable.svelte` のタイトル描画を変更（L227 付近）:
+  ```svelte
+  <Heading tag="h2" class="{metadata.titleFontSize ?? 'text-2xl'} pb-3 text-gray-900 dark:text-white">
+  ```
+- 既存プロバイダは未指定 → デフォルト `text-2xl` 維持（後方互換）。
+
+**critical files**: `contest_table_provider.ts`, `TaskTable.svelte`
+
+---
+
+## Phase 2: letter 割当ユーティリティ（TDD）
+
+新規 util（feature-scoped）: `src/features/tasks/utils/contest-table/aoj_icpc_labels.ts`
+
+- 上書き Map 定数（初期は空 or 既知の gap 年度のみ。中身は後日ユーザー提供）:
+  ```ts
+  // contest_id -> (task_table_index -> letter). Used only for years with judge gaps.
+  export const ICPC_PRELIM_LABEL_OVERRIDES: Record<string, Record<string, string>> = {
+    // e.g. ICPCPrelim2007: { '1150': 'A', '1152': 'C', ... }
+  };
+  ```
+- 関数:
+  ```ts
+  // Build task_table_index -> letter map for one contest.
+  // Default: sort indices numerically asc, assign A, B, C...
+  // Override: if ICPC_PRELIM_LABEL_OVERRIDES[contestId] exists, use it.
+  export function buildAojIcpcLetterMap(
+    contestId: string,
+    taskTableIndices: string[],
+  ): Map<string, string>;
+  ```
+- 隣接テスト `aoj_icpc_labels.test.ts`:
+  - 自動連番: `['1665','1664']` → `{1664:'A', 1665:'B'}`（数値昇順）。
+  - 上書き Map 経路: フィクスチャ contest_id で Map が優先されること。
+  - ICPC 国内予選は最大9問（A〜I）で収まる前提を明記。
+
+**critical file**: `aoj_icpc_labels.ts`（+ test）
+
+---
+
+## Phase 3: AojIcpcPrelimProvider（TDD・1クラス×year引数）
+
+新規 `src/features/tasks/utils/contest-table/aoj_icpc_providers.ts`
+
+```ts
+export class AojIcpcPrelimProvider extends ContestTableProviderBase {
+  private readonly year: number;
+  private readonly contestId: string;
+
+  constructor(contestType: ContestType, year: number) {
+    super(contestType, String(year)); // provider key: AOJ_ICPC::{year}
+    this.year = year;
+    this.contestId = `ICPCPrelim${year}`;
+  }
+
+  protected setFilterCondition() {
+    return (taskResult: TaskResult) => taskResult.contest_id === this.contestId;
+  }
+
+  // Override: prepend assigned letter to the title (display only; DB unchanged).
+  // ICPC titles are stored as "{name}" only, so no prefix removal is needed.
+  generateTable(filtered: TaskResults): ContestTable {
+    const letterMap = buildAojIcpcLetterMap(
+      this.contestId,
+      filtered.map((taskResult) => taskResult.task_table_index),
+    );
+    const table: ContestTable = { [this.contestId]: {} };
+
+    for (const taskResult of filtered) {
+      const index = taskResult.task_table_index;
+      const letter = letterMap.get(index) ?? index;
+      table[this.contestId][index] = { ...taskResult, title: `${letter}. ${taskResult.title}` };
+    }
+
+    return table;
+  }
+
+  // Ensure left-to-right cell order is numeric (A,B,C...). Safeguard for variable-width ids.
+  getHeaderIdsForTask(filtered: TaskResults): string[] {
+    return Array.from(new Set(filtered.map((taskResult) => taskResult.task_table_index))).sort(
+      (first, second) => Number(first) - Number(second),
+    );
+  }
+
+  getMetadata(): ContestTableMetaData {
+    return {
+      title: `ICPC 国内予選 ${this.year}`,
+      abbreviationName: `icpcPrelim${this.year}`,
+      titleFontSize: 'text-xl',
+    };
+  }
+
+  getDisplayConfig(): ContestTableDisplayConfig {
+    return {
+      isShownHeader: false,
+      isShownRoundLabel: false,
+      roundLabelWidth: '',
+      tableBodyCellsWidth: 'w-1/2 xs:w-1/3 sm:w-1/4 md:w-1/5 lg:w-1/6 2xl:w-1/7 px-1 py-2', // EDPC 相当
+      isShownTaskIndex: true, // show transformed "{letter}. {name}" as-is
+    };
+  }
+
+  getContestRoundLabel(): string {
+    return `ICPC 国内予選 ${this.year}`; // unused (isShownRoundLabel: false) but required
+  }
+}
+```
+
+- 隣接テスト `aoj_icpc_providers.test.ts`（Pattern 2 系・年度フィクスチャで検証）:
+  - `filter`: `ICPCPrelim2023` の行のみ抽出。
+  - `generateTable`: title が `A. ...` / `B. ...` に置換（DB の `task_table_index`/`task_id` は不変）。
+  - `getMetadata`: `title === 'ICPC 国内予選 2023'`、`titleFontSize === 'text-xl'`。
+  - `getDisplayConfig`: `isShownHeader === false` 等。
+  - 上書き Map フィクスチャ年度で letter が Map 通りになること。
+
+**critical files**: `aoj_icpc_providers.ts`（+ test）
+
+---
+
+## Phase 4: グループ登録（TDD・新規グループ）
+
+`src/features/tasks/utils/contest-table/contest_table_provider_groups.ts`
+
+```ts
+// Range of ICPC domestic-prelim years available on AOJ.
+// OLDEST is a stable domain constant (first season on AOJ).
+// LATEST must be bumped when a new season is seeded into prisma/tasks.ts.
+const ICPC_PRELIM_OLDEST_YEAR = 1998;
+const ICPC_PRELIM_LATEST_YEAR = 2025;
+
+AojIcpcPrelim: () => {
+  const group = new ContestTableProviderGroup('ICPC 国内予選', {
+    buttonLabel: 'ICPC 国内予選',
+    ariaLabel: 'Filter ICPC Domestic Preliminary',
+  });
+  // Iterate from latest to oldest so the newest year's table renders on top.
+  for (let year = ICPC_PRELIM_LATEST_YEAR; year >= ICPC_PRELIM_OLDEST_YEAR; year--) {
+    group.addProvider(new AojIcpcPrelimProvider(ContestType.AOJ_ICPC, year));
+  }
+  return group;
+},
+```
+
+- `contestTableProviderGroups` に `aojIcpcPrelim: presets.AojIcpcPrelim()` を追加（JOI 群の後ろ＝外部プラットフォーム位置）。
+- 定数 `ICPC_PRELIM_OLDEST_YEAR` / `ICPC_PRELIM_LATEST_YEAR` はモジュール冒頭に配置（`prepareContestProviderPresets` の外）。
+- `contest_table_provider_groups.test.ts` 更新:
+  - 新グループ名 / buttonLabel / ariaLabel。
+  - `getSize() === ICPC_PRELIM_LATEST_YEAR - ICPC_PRELIM_OLDEST_YEAR + 1`（= 28）。
+  - `getProvider(ContestType.AOJ_ICPC, '2023')` が `AojIcpcPrelimProvider` を返す。
+  - import 追加。
+- （任意）drift 検知: seed 中の最新 `ICPCPrelim` 年度が `ICPC_PRELIM_LATEST_YEAR` と一致することを検証するテストを追加すると、seed 追加時の定数未更新を防げる。
+
+**critical files**: `contest_table_provider_groups.ts`（+ group test）
+
+---
+
+## Phase 5: 最終検証
+
+- `pnpm test:unit`（特に `src/features/tasks/utils/contest-table/`）
+- `pnpm check`
+- `pnpm lint` / `pnpm format`
+- 手動/E2E 確認:
+  - `pnpm dev` → タスク一覧でボタン「ICPC 国内予選」を選択。
+  - 年度テーブルが **2025 → 1998 の順**で縦に並ぶ。
+  - 各セルが `A. (問題名)`、`B. (問題名)`… で表示され、タイトル見出しが他テーブルより小さい（`text-xl`）。
+  - 外部リンクが AOJ（`judge.u-aizu.ac.jp/.../id={task_id}`）へ遷移。
+
+---
+
+## 実装メモ
+
+- コミット粒度: Phase 0（seed）／ Phase 1（font config）／ Phase 2-3（util + provider）／ Phase 4（group）で分割。
+- gap 年度の上書き Map データはユーザー提供待ち。提供後に `ICPC_PRELIM_LABEL_OVERRIDES` を埋め、該当年度のテストを追加。
+- 26問超は ICPC 国内予選では発生しない（最大9問）ため A〜Z 超のロジックは実装しない（YAGNI）。
+
+## チェックリスト
+
+- [ ] Phase 0: AOJ API から seed 収集し `prisma/tasks.ts` に追加（1998〜2025）
+- [ ] Phase 1: `titleFontSize` 追加 + `TaskTable.svelte` 反映
+- [ ] Phase 2: `aoj_icpc_labels.ts`（letter util + 上書き Map）+ test
+- [ ] Phase 3: `aoj_icpc_providers.ts`（AojIcpcPrelimProvider）+ test
+- [ ] Phase 4: グループ登録 + groups test 更新
+- [ ] Phase 5: `pnpm test:unit` / `check` / `lint` / 手動確認
+- [ ] gap 年度 上書き Map（ユーザー提供後）
diff --git a/prisma/tasks.ts b/prisma/tasks.ts
index 31117ba0b..395864035 100755
--- a/prisma/tasks.ts
+++ b/prisma/tasks.ts
@@ -8704,6 +8704,1315 @@ export const tasks = [
     name: 'Driving on a Tree',
     title: 'D. Driving on a Tree',
   },
+  {
+    id: '1100',
+    contest_id: 'ICPCPrelim1998',
+    problem_index: '1100',
+    name: 'Area of Polygons',
+    title: 'Area of Polygons',
+  },
+  {
+    id: '1101',
+    contest_id: 'ICPCPrelim1998',
+    problem_index: '1101',
+    name: 'A Simple Offline Text Editor',
+    title: 'A Simple Offline Text Editor',
+  },
+  {
+    id: '1102',
+    contest_id: 'ICPCPrelim1998',
+    problem_index: '1102',
+    name: 'Calculation of Expressions',
+    title: 'Calculation of Expressions',
+  },
+  {
+    id: '1103',
+    contest_id: 'ICPCPrelim1998',
+    problem_index: '1103',
+    name: 'Board Arrangements for Concentration Games',
+    title: 'Board Arrangements for Concentration Games',
+  },
+  {
+    id: '1104',
+    contest_id: 'ICPCPrelim1999',
+    problem_index: '1104',
+    name: "Where's Your Robot?",
+    title: "Where's Your Robot?",
+  },
+  {
+    id: '1105',
+    contest_id: 'ICPCPrelim1999',
+    problem_index: '1105',
+    name: 'Unable Count',
+    title: 'Unable Count',
+  },
+  {
+    id: '1106',
+    contest_id: 'ICPCPrelim1999',
+    problem_index: '1106',
+    name: 'Factorization of Quadratic Formula',
+    title: 'Factorization of Quadratic Formula',
+  },
+  {
+    id: '1107',
+    contest_id: 'ICPCPrelim1999',
+    problem_index: '1107',
+    name: 'Spiral Footrace',
+    title: 'Spiral Footrace',
+  },
+  {
+    id: '1108',
+    contest_id: 'ICPCPrelim1999',
+    problem_index: '1108',
+    name: 'A Long Ride on a Railway',
+    title: 'A Long Ride on a Railway',
+  },
+  {
+    id: '1109',
+    contest_id: 'ICPCPrelim2000',
+    problem_index: '1109',
+    name: "Fermat's Last Theorem",
+    title: "Fermat's Last Theorem",
+  },
+  {
+    id: '1110',
+    contest_id: 'ICPCPrelim2000',
+    problem_index: '1110',
+    name: 'Patience',
+    title: 'Patience',
+  },
+  {
+    id: '1111',
+    contest_id: 'ICPCPrelim2000',
+    problem_index: '1111',
+    name: 'Cyber Guardian',
+    title: 'Cyber Guardian',
+  },
+  {
+    id: '1112',
+    contest_id: 'ICPCPrelim2000',
+    problem_index: '1112',
+    name: 'Strange Key',
+    title: 'Strange Key',
+  },
+  {
+    id: '1114',
+    contest_id: 'ICPCPrelim2001',
+    problem_index: '1114',
+    name: 'Get a Rectangular Field',
+    title: 'Get a Rectangular Field',
+  },
+  {
+    id: '1115',
+    contest_id: 'ICPCPrelim2001',
+    problem_index: '1115',
+    name: 'Multi-column List',
+    title: 'Multi-column List',
+  },
+  {
+    id: '1116',
+    contest_id: 'ICPCPrelim2001',
+    problem_index: '1116',
+    name: 'Jigsaw Puzzles for Computers',
+    title: 'Jigsaw Puzzles for Computers',
+  },
+  {
+    id: '1117',
+    contest_id: 'ICPCPrelim2001',
+    problem_index: '1117',
+    name: 'Missing Numbers',
+    title: 'Missing Numbers',
+  },
+  {
+    id: '1118',
+    contest_id: 'ICPCPrelim2001',
+    problem_index: '1118',
+    name: 'Nets of Dice',
+    title: 'Nets of Dice',
+  },
+  {
+    id: '1119',
+    contest_id: 'ICPCPrelim2002',
+    problem_index: '1119',
+    name: 'Exploring Caves',
+    title: 'Exploring Caves',
+  },
+  {
+    id: '1120',
+    contest_id: 'ICPCPrelim2002',
+    problem_index: '1120',
+    name: 'Pile Up!',
+    title: 'Pile Up!',
+  },
+  {
+    id: '1121',
+    contest_id: 'ICPCPrelim2002',
+    problem_index: '1121',
+    name: 'Kanglish:Analysis on Artificial Language',
+    title: 'Kanglish:Analysis on Artificial Language',
+  },
+  {
+    id: '1122',
+    contest_id: 'ICPCPrelim2002',
+    problem_index: '1122',
+    name: 'What is the Number in my Mind ?',
+    title: 'What is the Number in my Mind ?',
+  },
+  {
+    id: '1124',
+    contest_id: 'ICPCPrelim2003',
+    problem_index: '1124',
+    name: 'When Can We Meet?',
+    title: 'When Can We Meet?',
+  },
+  {
+    id: '1125',
+    contest_id: 'ICPCPrelim2003',
+    problem_index: '1125',
+    name: 'Get Many Persimmon Trees',
+    title: 'Get Many Persimmon Trees',
+  },
+  {
+    id: '1126',
+    contest_id: 'ICPCPrelim2003',
+    problem_index: '1126',
+    name: 'The Secret Number',
+    title: 'The Secret Number',
+  },
+  {
+    id: '1127',
+    contest_id: 'ICPCPrelim2003',
+    problem_index: '1127',
+    name: 'Building a Space Station',
+    title: 'Building a Space Station',
+  },
+  {
+    id: '1128',
+    contest_id: 'ICPCPrelim2003',
+    problem_index: '1128',
+    name: 'Square Carpets',
+    title: 'Square Carpets',
+  },
+  {
+    id: '1129',
+    contest_id: 'ICPCPrelim2004',
+    problem_index: '1129',
+    name: 'Hanafuda Shuffle',
+    title: 'Hanafuda Shuffle',
+  },
+  {
+    id: '1130',
+    contest_id: 'ICPCPrelim2004',
+    problem_index: '1130',
+    name: 'Red and Black',
+    title: 'Red and Black',
+  },
+  {
+    id: '1131',
+    contest_id: 'ICPCPrelim2004',
+    problem_index: '1131',
+    name: 'Unit Fraction Partition',
+    title: 'Unit Fraction Partition',
+  },
+  {
+    id: '1132',
+    contest_id: 'ICPCPrelim2004',
+    problem_index: '1132',
+    name: 'Circle and Points',
+    title: 'Circle and Points',
+  },
+  {
+    id: '1133',
+    contest_id: 'ICPCPrelim2004',
+    problem_index: '1133',
+    name: 'Water Tank',
+    title: 'Water Tank',
+  },
+  {
+    id: '1134',
+    contest_id: 'ICPCPrelim2004',
+    problem_index: '1134',
+    name: 'Name the Crossing',
+    title: 'Name the Crossing',
+  },
+  {
+    id: '1135',
+    contest_id: 'ICPCPrelim2005',
+    problem_index: '1135',
+    name: "Ohgas' Fortune",
+    title: "Ohgas' Fortune",
+  },
+  {
+    id: '1136',
+    contest_id: 'ICPCPrelim2005',
+    problem_index: '1136',
+    name: 'Polygonal Line Search',
+    title: 'Polygonal Line Search',
+  },
+  {
+    id: '1137',
+    contest_id: 'ICPCPrelim2005',
+    problem_index: '1137',
+    name: 'Numeral System',
+    title: 'Numeral System',
+  },
+  {
+    id: '1138',
+    contest_id: 'ICPCPrelim2005',
+    problem_index: '1138',
+    name: 'Traveling by Stagecoach',
+    title: 'Traveling by Stagecoach',
+  },
+  {
+    id: '1139',
+    contest_id: 'ICPCPrelim2005',
+    problem_index: '1139',
+    name: 'Earth Observation with a Mobile Robot Team',
+    title: 'Earth Observation with a Mobile Robot Team',
+  },
+  {
+    id: '1140',
+    contest_id: 'ICPCPrelim2005',
+    problem_index: '1140',
+    name: 'Cleaning Robot',
+    title: 'Cleaning Robot',
+  },
+  {
+    id: '1141',
+    contest_id: 'ICPCPrelim2006',
+    problem_index: '1141',
+    name: "Dirichlet's Theorem on Arithmetic Progressions",
+    title: "Dirichlet's Theorem on Arithmetic Progressions",
+  },
+  {
+    id: '1142',
+    contest_id: 'ICPCPrelim2006',
+    problem_index: '1142',
+    name: 'Organize Your Train part II',
+    title: 'Organize Your Train part II',
+  },
+  {
+    id: '1143',
+    contest_id: 'ICPCPrelim2006',
+    problem_index: '1143',
+    name: 'Hexerpents of Hexwamp',
+    title: 'Hexerpents of Hexwamp',
+  },
+  {
+    id: '1144',
+    contest_id: 'ICPCPrelim2006',
+    problem_index: '1144',
+    name: 'Curling 2.0',
+    title: 'Curling 2.0',
+  },
+  {
+    id: '1145',
+    contest_id: 'ICPCPrelim2006',
+    problem_index: '1145',
+    name: 'The Genome Database of All Space Life',
+    title: 'The Genome Database of All Space Life',
+  },
+  {
+    id: '1146',
+    contest_id: 'ICPCPrelim2006',
+    problem_index: '1146',
+    name: 'Secrets in Shadows',
+    title: 'Secrets in Shadows',
+  },
+  {
+    id: '1147',
+    contest_id: 'ICPCPrelim2007',
+    problem_index: '1147',
+    name: 'ICPC Score Totalizer Software',
+    title: 'ICPC Score Totalizer Software',
+  },
+  {
+    id: '1148',
+    contest_id: 'ICPCPrelim2007',
+    problem_index: '1148',
+    name: 'Analyzing Login/Logout Records',
+    title: 'Analyzing Login/Logout Records',
+  },
+  {
+    id: '1149',
+    contest_id: 'ICPCPrelim2007',
+    problem_index: '1149',
+    name: 'Cut the Cake',
+    title: 'Cut the Cake',
+  },
+  {
+    id: '1150',
+    contest_id: 'ICPCPrelim2007',
+    problem_index: '1150',
+    name: 'Cliff Climbing',
+    title: 'Cliff Climbing',
+  },
+  {
+    id: '1151',
+    contest_id: 'ICPCPrelim2007',
+    problem_index: '1151',
+    name: 'Twirl Around',
+    title: 'Twirl Around',
+  },
+  {
+    id: '1152',
+    contest_id: 'ICPCPrelim2007',
+    problem_index: '1152',
+    name: 'Dr. Podboq or: How We Became Asymmetric',
+    title: 'Dr. Podboq or: How We Became Asymmetric',
+  },
+  {
+    id: '1153',
+    contest_id: 'ICPCPrelim2008',
+    problem_index: '1153',
+    name: 'Equal Total Scores',
+    title: 'Equal Total Scores',
+  },
+  {
+    id: '1154',
+    contest_id: 'ICPCPrelim2008',
+    problem_index: '1154',
+    name: 'Monday-Saturday Prime Factors',
+    title: 'Monday-Saturday Prime Factors',
+  },
+  {
+    id: '1155',
+    contest_id: 'ICPCPrelim2008',
+    problem_index: '1155',
+    name: 'How can I satisfy thee? Let me count the ways...',
+    title: 'How can I satisfy thee? Let me count the ways...',
+  },
+  {
+    id: '1156',
+    contest_id: 'ICPCPrelim2008',
+    problem_index: '1156',
+    name: 'Twirling Robot',
+    title: 'Twirling Robot',
+  },
+  {
+    id: '1157',
+    contest_id: 'ICPCPrelim2008',
+    problem_index: '1157',
+    name: 'Roll-A-Big-Ball',
+    title: 'Roll-A-Big-Ball',
+  },
+  {
+    id: '1158',
+    contest_id: 'ICPCPrelim2008',
+    problem_index: '1158',
+    name: 'ICPC: Intelligent Congruent Partition of Chocolate',
+    title: 'ICPC: Intelligent Congruent Partition of Chocolate',
+  },
+  {
+    id: '1159',
+    contest_id: 'ICPCPrelim2009',
+    problem_index: '1159',
+    name: 'Next Mayor',
+    title: 'Next Mayor',
+  },
+  {
+    id: '1160',
+    contest_id: 'ICPCPrelim2009',
+    problem_index: '1160',
+    name: 'How Many Islands?',
+    title: 'How Many Islands?',
+  },
+  {
+    id: '1161',
+    contest_id: 'ICPCPrelim2009',
+    problem_index: '1161',
+    name: 'Verbal Arithmetic',
+    title: 'Verbal Arithmetic',
+  },
+  {
+    id: '1162',
+    contest_id: 'ICPCPrelim2009',
+    problem_index: '1162',
+    name: 'Discrete Speed',
+    title: 'Discrete Speed',
+  },
+  {
+    id: '1163',
+    contest_id: 'ICPCPrelim2009',
+    problem_index: '1163',
+    name: 'Cards',
+    title: 'Cards',
+  },
+  {
+    id: '1164',
+    contest_id: 'ICPCPrelim2009',
+    problem_index: '1164',
+    name: 'Tighten Up!',
+    title: 'Tighten Up!',
+  },
+  {
+    id: '1165',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1165',
+    name: "Pablo Squarson's Headache",
+    title: "Pablo Squarson's Headache",
+  },
+  {
+    id: '1166',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1166',
+    name: 'Amazing Mazes',
+    title: 'Amazing Mazes',
+  },
+  {
+    id: '1167',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1167',
+    name: "Pollock's conjecture",
+    title: "Pollock's conjecture",
+  },
+  {
+    id: '1168',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1168',
+    name: 'Off Balance',
+    title: 'Off Balance',
+  },
+  {
+    id: '1169',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1169',
+    name: 'The Most Powerful Spell',
+    title: 'The Most Powerful Spell',
+  },
+  {
+    id: '1170',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1170',
+    name: 'Old Memories',
+    title: 'Old Memories',
+  },
+  {
+    id: '1171',
+    contest_id: 'ICPCPrelim2010',
+    problem_index: '1171',
+    name: 'Laser Beam Reflections',
+    title: 'Laser Beam Reflections',
+  },
+  {
+    id: '1172',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1172',
+    name: "Chebyshev's Theorem",
+    title: "Chebyshev's Theorem",
+  },
+  {
+    id: '1173',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1173',
+    name: 'The Balance of the World',
+    title: 'The Balance of the World',
+  },
+  {
+    id: '1174',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1174',
+    name: 'Identically Colored Panels Connection',
+    title: 'Identically Colored Panels Connection',
+  },
+  {
+    id: '1175',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1175',
+    name: 'And Then. How Many Are There?',
+    title: 'And Then. How Many Are There?',
+  },
+  {
+    id: '1176',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1176',
+    name: 'Planning Rolling Blackouts',
+    title: 'Planning Rolling Blackouts',
+  },
+  {
+    id: '1177',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1177',
+    name: 'Watchdog Corporation',
+    title: 'Watchdog Corporation',
+  },
+  {
+    id: '1178',
+    contest_id: 'ICPCPrelim2011',
+    problem_index: '1178',
+    name: 'A Broken Door',
+    title: 'A Broken Door',
+  },
+  {
+    id: '1179',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1179',
+    name: 'Millennium',
+    title: 'Millennium',
+  },
+  {
+    id: '1180',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1180',
+    name: 'Recurring Decimals',
+    title: 'Recurring Decimals',
+  },
+  {
+    id: '1181',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1181',
+    name: 'Biased Dice',
+    title: 'Biased Dice',
+  },
+  {
+    id: '1182',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1182',
+    name: 'Railway Connection',
+    title: 'Railway Connection',
+  },
+  {
+    id: '1183',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1183',
+    name: 'Chain-Confined Path',
+    title: 'Chain-Confined Path',
+  },
+  {
+    id: '1184',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1184',
+    name: 'Generic Poker',
+    title: 'Generic Poker',
+  },
+  {
+    id: '1185',
+    contest_id: 'ICPCPrelim2012',
+    problem_index: '1185',
+    name: 'Patisserie ACM',
+    title: 'Patisserie ACM',
+  },
+  {
+    id: '1186',
+    contest_id: 'ICPCPrelim2013',
+    problem_index: '1186',
+    name: 'Integral Rectangles',
+    title: 'Integral Rectangles',
+  },
+  {
+    id: '1187',
+    contest_id: 'ICPCPrelim2013',
+    problem_index: '1187',
+    name: 'ICPC Ranking',
+    title: 'ICPC Ranking',
+  },
+  {
+    id: '1188',
+    contest_id: 'ICPCPrelim2013',
+    problem_index: '1188',
+    name: 'Hierarchical Democracy',
+    title: 'Hierarchical Democracy',
+  },
+  {
+    id: '1189',
+    contest_id: 'ICPCPrelim2013',
+    problem_index: '1189',
+    name: 'Prime Caves',
+    title: 'Prime Caves',
+  },
+  {
+    id: '1190',
+    contest_id: 'ICPCPrelim2013',
+    problem_index: '1190',
+    name: 'Anchored Balloon',
+    title: 'Anchored Balloon',
+  },
+  {
+    id: '1191',
+    contest_id: 'ICPCPrelim2013',
+    problem_index: '1191',
+    name: 'Rotate and Rewrite',
+    title: 'Rotate and Rewrite',
+  },
+  {
+    id: '1192',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1192',
+    name: 'Tax Rate Changed',
+    title: 'Tax Rate Changed',
+  },
+  {
+    id: '1193',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1193',
+    name: 'Chain Disappearance Puzzle',
+    title: 'Chain Disappearance Puzzle',
+  },
+  {
+    id: '1194',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1194',
+    name: 'Vampire',
+    title: 'Vampire',
+  },
+  {
+    id: '1195',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1195',
+    name: 'Encryption System',
+    title: 'Encryption System',
+  },
+  {
+    id: '1196',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1196',
+    name: 'Bridge Removal',
+    title: 'Bridge Removal',
+  },
+  {
+    id: '1197',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1197',
+    name: 'A Die Maker',
+    title: 'A Die Maker',
+  },
+  {
+    id: '1198',
+    contest_id: 'ICPCPrelim2014',
+    problem_index: '1198',
+    name: "Don't Cross the Circles!",
+    title: "Don't Cross the Circles!",
+  },
+  {
+    id: '1600',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1600',
+    name: 'Entrance Examination',
+    title: 'Entrance Examination',
+  },
+  {
+    id: '1601',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1601',
+    name: 'Short Phrase',
+    title: 'Short Phrase',
+  },
+  {
+    id: '1602',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1602',
+    name: 'ICPC Calculator',
+    title: 'ICPC Calculator',
+  },
+  {
+    id: '1603',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1603',
+    name: '500-yen Saving',
+    title: '500-yen Saving',
+  },
+  {
+    id: '1604',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1604',
+    name: 'Deadlock Detection',
+    title: 'Deadlock Detection',
+  },
+  {
+    id: '1605',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1605',
+    name: 'Bridge Construction Planning',
+    title: 'Bridge Construction Planning',
+  },
+  {
+    id: '1606',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1606',
+    name: 'Complex Paper Folding',
+    title: 'Complex Paper Folding',
+  },
+  {
+    id: '1607',
+    contest_id: 'ICPCPrelim2015',
+    problem_index: '1607',
+    name: 'Development of Small Flying Robots',
+    title: 'Development of Small Flying Robots',
+  },
+  {
+    id: '1608',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1608',
+    name: 'Selection of Participants of an Experiment',
+    title: 'Selection of Participants of an Experiment',
+  },
+  {
+    id: '1609',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1609',
+    name: 'Look for the Winner!',
+    title: 'Look for the Winner!',
+  },
+  {
+    id: '1610',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1610',
+    name: 'Bamboo Blossoms',
+    title: 'Bamboo Blossoms',
+  },
+  {
+    id: '1611',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1611',
+    name: 'Daruma Otoshi',
+    title: 'Daruma Otoshi',
+  },
+  {
+    id: '1612',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1612',
+    name: '3D Printing',
+    title: '3D Printing',
+  },
+  {
+    id: '1613',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1613',
+    name: 'Deciphering Characters',
+    title: 'Deciphering Characters',
+  },
+  {
+    id: '1614',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1614',
+    name: 'Warp Drive',
+    title: 'Warp Drive',
+  },
+  {
+    id: '1615',
+    contest_id: 'ICPCPrelim2016',
+    problem_index: '1615',
+    name: 'Gift Exchange Party',
+    title: 'Gift Exchange Party',
+  },
+  {
+    id: '1616',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1616',
+    name: "Taro's Shopping",
+    title: "Taro's Shopping",
+  },
+  {
+    id: '1617',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1617',
+    name: 'Almost Identical Programs',
+    title: 'Almost Identical Programs',
+  },
+  {
+    id: '1618',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1618',
+    name: 'A Garden with Ponds',
+    title: 'A Garden with Ponds',
+  },
+  {
+    id: '1619',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1619',
+    name: 'Making Lunch Boxes',
+    title: 'Making Lunch Boxes',
+  },
+  {
+    id: '1620',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1620',
+    name: 'Boolean Expression Compressor',
+    title: 'Boolean Expression Compressor',
+  },
+  {
+    id: '1621',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1621',
+    name: 'Folding a Ribbon',
+    title: 'Folding a Ribbon',
+  },
+  {
+    id: '1622',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1622',
+    name: 'Go around the Labyrinth',
+    title: 'Go around the Labyrinth',
+  },
+  {
+    id: '1623',
+    contest_id: 'ICPCPrelim2017',
+    problem_index: '1623',
+    name: 'Equivalent Deformation',
+    title: 'Equivalent Deformation',
+  },
+  {
+    id: '1624',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1624',
+    name: 'Income Inequality',
+    title: 'Income Inequality',
+  },
+  {
+    id: '1625',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1625',
+    name: 'Origami, or the art of folding paper',
+    title: 'Origami, or the art of folding paper',
+  },
+  {
+    id: '1626',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1626',
+    name: 'Skyscraper MinatoHarukas',
+    title: 'Skyscraper MinatoHarukas',
+  },
+  {
+    id: '1627',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1627',
+    name: 'Playoff by all the teams',
+    title: 'Playoff by all the teams',
+  },
+  {
+    id: '1628',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1628',
+    name: 'Floating-Point Numbers',
+    title: 'Floating-Point Numbers',
+  },
+  {
+    id: '1629',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1629',
+    name: 'Equilateral Triangular Fence',
+    title: 'Equilateral Triangular Fence',
+  },
+  {
+    id: '1630',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1630',
+    name: 'Expression Mining',
+    title: 'Expression Mining',
+  },
+  {
+    id: '1631',
+    contest_id: 'ICPCPrelim2018',
+    problem_index: '1631',
+    name: 'For Programming Excellence',
+    title: 'For Programming Excellence',
+  },
+  {
+    id: '1632',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1632',
+    name: 'Scores of Final Examination',
+    title: 'Scores of Final Examination',
+  },
+  {
+    id: '1633',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1633',
+    name: 'On-Screen Keyboard',
+    title: 'On-Screen Keyboard',
+  },
+  {
+    id: '1634',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1634',
+    name: 'Balance Scale',
+    title: 'Balance Scale',
+  },
+  {
+    id: '1635',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1635',
+    name: 'Tally Counters',
+    title: 'Tally Counters',
+  },
+  {
+    id: '1636',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1636',
+    name: 'Cube Surface Puzzle',
+    title: 'Cube Surface Puzzle',
+  },
+  {
+    id: '1637',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1637',
+    name: 'Flipping Colors',
+    title: 'Flipping Colors',
+  },
+  {
+    id: '1638',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1638',
+    name: "Let's Move Tiles!",
+    title: "Let's Move Tiles!",
+  },
+  {
+    id: '1639',
+    contest_id: 'ICPCPrelim2019',
+    problem_index: '1639',
+    name: 'Addition on Convex Polygons',
+    title: 'Addition on Convex Polygons',
+  },
+  {
+    id: '1640',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1640',
+    name: 'Count Up 2020',
+    title: 'Count Up 2020',
+  },
+  {
+    id: '1641',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1641',
+    name: 'Contact Tracer',
+    title: 'Contact Tracer',
+  },
+  {
+    id: '1642',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1642',
+    name: 'Luggage',
+    title: 'Luggage',
+  },
+  {
+    id: '1643',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1643',
+    name: 'Icpcan Alphabet',
+    title: 'Icpcan Alphabet',
+  },
+  {
+    id: '1644',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1644',
+    name: 'Keima',
+    title: 'Keima',
+  },
+  {
+    id: '1645',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1645',
+    name: 'Evacuation Site',
+    title: 'Evacuation Site',
+  },
+  {
+    id: '1646',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1646',
+    name: 'Avoiding Three Cs',
+    title: 'Avoiding Three Cs',
+  },
+  {
+    id: '1647',
+    contest_id: 'ICPCPrelim2020',
+    problem_index: '1647',
+    name: 'Idealistic Canister',
+    title: 'Idealistic Canister',
+  },
+  {
+    id: '1648',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1648',
+    name: 'Marbles Tell Your Lucky Number',
+    title: 'Marbles Tell Your Lucky Number',
+  },
+  {
+    id: '1649',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1649',
+    name: 'Hundred-Cell Calculation Puzzles',
+    title: 'Hundred-Cell Calculation Puzzles',
+  },
+  {
+    id: '1650',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1650',
+    name: 'Tree Transformation Puzzle',
+    title: 'Tree Transformation Puzzle',
+  },
+  {
+    id: '1651',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1651',
+    name: 'Handing out Balloons',
+    title: 'Handing out Balloons',
+  },
+  {
+    id: '1652',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1652',
+    name: 'Time is Money',
+    title: 'Time is Money',
+  },
+  {
+    id: '1653',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1653',
+    name: "Princess' Perfectionism",
+    title: "Princess' Perfectionism",
+  },
+  {
+    id: '1654',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1654',
+    name: 'Positioning the Lights',
+    title: 'Positioning the Lights',
+  },
+  {
+    id: '1655',
+    contest_id: 'ICPCPrelim2021',
+    problem_index: '1655',
+    name: 'Ninja Escape',
+    title: 'Ninja Escape',
+  },
+  {
+    id: '1656',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1656',
+    name: 'Counting Peaks of Infection',
+    title: 'Counting Peaks of Infection',
+  },
+  {
+    id: '1657',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1657',
+    name: 'Leave No One Behind',
+    title: 'Leave No One Behind',
+  },
+  {
+    id: '1658',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1658',
+    name: 'Training Schedule for ICPC',
+    title: 'Training Schedule for ICPC',
+  },
+  {
+    id: '1659',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1659',
+    name: 'Audience Queue',
+    title: 'Audience Queue',
+  },
+  {
+    id: '1660',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1660',
+    name: 'Village of Lore',
+    title: 'Village of Lore',
+  },
+  {
+    id: '1661',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1661',
+    name: 'Trim It Step by Step',
+    title: 'Trim It Step by Step',
+  },
+  {
+    id: '1662',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1662',
+    name: 'Keep in Touch',
+    title: 'Keep in Touch',
+  },
+  {
+    id: '1663',
+    contest_id: 'ICPCPrelim2022',
+    problem_index: '1663',
+    name: 'Artist in Agony',
+    title: 'Artist in Agony',
+  },
+  {
+    id: '1664',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1664',
+    name: 'Which Team Should Receive the Sponsor Prize?',
+    title: 'Which Team Should Receive the Sponsor Prize?',
+  },
+  {
+    id: '1665',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1665',
+    name: 'Amidakuji',
+    title: 'Amidakuji',
+  },
+  {
+    id: '1666',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1666',
+    name: 'Changing the Sitting Arrangement',
+    title: 'Changing the Sitting Arrangement',
+  },
+  {
+    id: '1667',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1667',
+    name: 'Efficient Problem Set',
+    title: 'Efficient Problem Set',
+  },
+  {
+    id: '1668',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1668',
+    name: 'Tampered Records',
+    title: 'Tampered Records',
+  },
+  {
+    id: '1669',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1669',
+    name: 'Villa of Emblem Shape',
+    title: 'Villa of Emblem Shape',
+  },
+  {
+    id: '1670',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1670',
+    name: 'Fair Deal of Dice',
+    title: 'Fair Deal of Dice',
+  },
+  {
+    id: '1671',
+    contest_id: 'ICPCPrelim2023',
+    problem_index: '1671',
+    name: 'Planning Locations of Bus Stops',
+    title: 'Planning Locations of Bus Stops',
+  },
+  {
+    id: '1672',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1672',
+    name: 'Snacks within 300 Yen',
+    title: 'Snacks within 300 Yen',
+  },
+  {
+    id: '1673',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1673',
+    name: 'Overtaking',
+    title: 'Overtaking',
+  },
+  {
+    id: '1674',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1674',
+    name: 'Honeycomb Distance',
+    title: 'Honeycomb Distance',
+  },
+  {
+    id: '1675',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1675',
+    name: "A Bug That's Not a Pill Bug",
+    title: "A Bug That's Not a Pill Bug",
+  },
+  {
+    id: '1676',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1676',
+    name: 'Colorful Residential Area',
+    title: 'Colorful Residential Area',
+  },
+  {
+    id: '1677',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1677',
+    name: 'Billiards',
+    title: 'Billiards',
+  },
+  {
+    id: '1678',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1678',
+    name: 'Two Sets of Cards',
+    title: 'Two Sets of Cards',
+  },
+  {
+    id: '1679',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1679',
+    name: 'Blocking the Way',
+    title: 'Blocking the Way',
+  },
+  {
+    id: '1680',
+    contest_id: 'ICPCPrelim2024',
+    problem_index: '1680',
+    name: 'All Survived?',
+    title: 'All Survived?',
+  },
+  {
+    id: '1681',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1681',
+    name: '2025',
+    title: '2025',
+  },
+  {
+    id: '1682',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1682',
+    name: 'Prefix and Suffix Can Be the Same',
+    title: 'Prefix and Suffix Can Be the Same',
+  },
+  {
+    id: '1683',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1683',
+    name: 'Calendar of an Enthusiastic Worker',
+    title: 'Calendar of an Enthusiastic Worker',
+  },
+  {
+    id: '1684',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1684',
+    name: 'Ancient Game Board',
+    title: 'Ancient Game Board',
+  },
+  {
+    id: '1685',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1685',
+    name: 'To Be Discontinued',
+    title: 'To Be Discontinued',
+  },
+  {
+    id: '1686',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1686',
+    name: 'Dog Tricks',
+    title: 'Dog Tricks',
+  },
+  {
+    id: '1687',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1687',
+    name: 'Number of Faces',
+    title: 'Number of Faces',
+  },
+  {
+    id: '1688',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1688',
+    name: 'Parentheses',
+    title: 'Parentheses',
+  },
+  {
+    id: '1689',
+    contest_id: 'ICPCPrelim2025',
+    problem_index: '1689',
+    name: 'Preparing the Lunch',
+    title: 'Preparing the Lunch',
+  },
   {
     id: '2389',
     contest_id: 'JAGSpring2012',
diff --git a/src/features/tasks/components/contest-table/TaskTable.svelte b/src/features/tasks/components/contest-table/TaskTable.svelte
index 821491b79..c3048c395 100644
--- a/src/features/tasks/components/contest-table/TaskTable.svelte
+++ b/src/features/tasks/components/contest-table/TaskTable.svelte
@@ -224,7 +224,10 @@
   {@const contestTable = getTaskTable(metadata.abbreviationName)}
 
   <!-- Title -->
-  <Heading tag="h2" class="text-2xl pb-3 text-gray-900 dark:text-white">
+  <Heading
+    tag="h2"
+    class="{metadata.titleFontSize ?? 'text-2xl'} pb-3 text-gray-900 dark:text-white"
+  >
     {metadata.title}
   </Heading>
 
diff --git a/src/features/tasks/types/contest-table/contest_table_provider.ts b/src/features/tasks/types/contest-table/contest_table_provider.ts
index 19fa3f6f9..cd174e64a 100644
--- a/src/features/tasks/types/contest-table/contest_table_provider.ts
+++ b/src/features/tasks/types/contest-table/contest_table_provider.ts
@@ -127,10 +127,12 @@ export type ContestTable = Record<string, Record<string, TaskResult>>;
  * @typedef {Object} ContestTableMetaData
  * @property {string} title - The title text to display for the contest table.
  * @property {string} abbreviationName - Contest abbreviation, used for map keys.
+ * @property {string} [titleFontSize] - Tailwind class for title font size, e.g. 'text-xl'. Defaults to 'text-2xl' at render.
  */
 export type ContestTableMetaData = {
   title: string;
   abbreviationName: string;
+  titleFontSize?: string;
 };
 
 /**
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_labels.test.ts b/src/features/tasks/utils/contest-table/aoj_icpc_labels.test.ts
new file mode 100644
index 000000000..5e746851d
--- /dev/null
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_labels.test.ts
@@ -0,0 +1,56 @@
+import { describe, test, expect, beforeEach, afterEach } from 'vitest';
+
+import { buildAojIcpcLetterMap, ICPC_PRELIM_LABEL_OVERRIDES } from './aoj_icpc_labels';
+
+describe('buildAojIcpcLetterMap', () => {
+  test('sorts indices numerically ascending and assigns letters A, B, C...', () => {
+    const result = buildAojIcpcLetterMap('ICPCPrelim2023', ['1665', '1664']);
+
+    expect(result.get('1664')).toBe('A');
+    expect(result.get('1665')).toBe('B');
+    expect(result.size).toBe(2);
+  });
+
+  test('returns empty Map for empty input', () => {
+    const result = buildAojIcpcLetterMap('ICPCPrelim2023', []);
+
+    expect(result.size).toBe(0);
+  });
+
+  test('returns Map with single entry assigned letter A', () => {
+    const result = buildAojIcpcLetterMap('ICPCPrelim2023', ['1000']);
+
+    expect(result.get('1000')).toBe('A');
+    expect(result.size).toBe(1);
+  });
+
+  describe('override path', () => {
+    beforeEach(() => {
+      ICPC_PRELIM_LABEL_OVERRIDES['ICPCPrelimTest'] = {
+        '1150': 'A',
+        '1152': 'C',
+        '1155': 'E',
+      };
+    });
+
+    afterEach(() => {
+      delete ICPC_PRELIM_LABEL_OVERRIDES['ICPCPrelimTest'];
+    });
+
+    test('uses override map when contest_id has an entry in ICPC_PRELIM_LABEL_OVERRIDES', () => {
+      const result = buildAojIcpcLetterMap('ICPCPrelimTest', ['1150', '1152', '1155']);
+
+      expect(result.get('1150')).toBe('A');
+      expect(result.get('1152')).toBe('C');
+      expect(result.get('1155')).toBe('E');
+      expect(result.size).toBe(3);
+    });
+
+    test('ignores the input indices and uses only the override map entries', () => {
+      const result = buildAojIcpcLetterMap('ICPCPrelimTest', ['1150', '1152', '1155']);
+
+      expect(result.has('1151')).toBe(false);
+      expect(result.has('1153')).toBe(false);
+    });
+  });
+});
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_labels.ts b/src/features/tasks/utils/contest-table/aoj_icpc_labels.ts
new file mode 100644
index 000000000..97ce21e12
--- /dev/null
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_labels.ts
@@ -0,0 +1,25 @@
+// contest_id -> (task_table_index -> letter). Used only for years with judge gaps.
+export const ICPC_PRELIM_LABEL_OVERRIDES: Record<string, Record<string, string>> = {};
+
+// Build task_table_index -> letter map for one contest.
+// Default: sort indices numerically asc, assign A, B, C...
+// Override: if ICPC_PRELIM_LABEL_OVERRIDES[contestId] exists, use it.
+export function buildAojIcpcLetterMap(
+  contestId: string,
+  taskTableIndices: string[],
+): Map<string, string> {
+  const override = ICPC_PRELIM_LABEL_OVERRIDES[contestId];
+
+  if (override !== undefined) {
+    return new Map(Object.entries(override));
+  }
+
+  const sorted = [...taskTableIndices].sort((first, second) => Number(first) - Number(second));
+  const map = new Map<string, string>();
+
+  for (let i = 0; i < sorted.length; i++) {
+    map.set(sorted[i], String.fromCharCode(65 + i));
+  }
+
+  return map;
+}
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts b/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
new file mode 100644
index 000000000..78ae26930
--- /dev/null
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
@@ -0,0 +1,391 @@
+import { describe, test, expect, beforeEach, afterEach } from 'vitest';
+
+import { ContestType } from '$lib/types/contest';
+import type { TaskResults } from '$lib/types/task';
+
+import { ICPC_PRELIM_LABEL_OVERRIDES } from './aoj_icpc_labels';
+import { AojIcpcPrelimProvider } from './aoj_icpc_providers';
+
+const createProvider = (year: number) => new AojIcpcPrelimProvider(ContestType.AOJ_ICPC, year);
+
+// ICPCPrelim1998: 4 problems (A–D), oldest year on AOJ
+const tasks1998: TaskResults = [
+  {
+    contest_id: 'ICPCPrelim1998',
+    task_id: '1100',
+    task_table_index: '1100',
+    title: 'Area of Polygons',
+  },
+  {
+    contest_id: 'ICPCPrelim1998',
+    task_id: '1101',
+    task_table_index: '1101',
+    title: 'A Simple Offline Text Editor',
+  },
+  {
+    contest_id: 'ICPCPrelim1998',
+    task_id: '1102',
+    task_table_index: '1102',
+    title: 'Calculation of Expressions',
+  },
+  {
+    contest_id: 'ICPCPrelim1998',
+    task_id: '1103',
+    task_table_index: '1103',
+    title: 'Board Arrangements for Concentration Games',
+  },
+] as TaskResults;
+
+// ICPCPrelim2023: 8 problems (A–H), used as the primary fixture
+const tasks2023: TaskResults = [
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1664',
+    task_table_index: '1664',
+    title: 'Which Team Should Receive the Sponsor Prize?',
+  },
+  { contest_id: 'ICPCPrelim2023', task_id: '1665', task_table_index: '1665', title: 'Amidakuji' },
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1666',
+    task_table_index: '1666',
+    title: 'Changing the Sitting Arrangement',
+  },
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1667',
+    task_table_index: '1667',
+    title: 'Efficient Problem Set',
+  },
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1668',
+    task_table_index: '1668',
+    title: 'Tampered Records',
+  },
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1669',
+    task_table_index: '1669',
+    title: 'Villa of Emblem Shape',
+  },
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1670',
+    task_table_index: '1670',
+    title: 'Fair Deal of Dice',
+  },
+  {
+    contest_id: 'ICPCPrelim2023',
+    task_id: '1671',
+    task_table_index: '1671',
+    title: 'Planning Locations of Bus Stops',
+  },
+] as TaskResults;
+
+// ICPCPrelim2025: 9 problems (A–I), latest year and maximum problem count
+const tasks2025: TaskResults = [
+  { contest_id: 'ICPCPrelim2025', task_id: '1681', task_table_index: '1681', title: '2025' },
+  {
+    contest_id: 'ICPCPrelim2025',
+    task_id: '1682',
+    task_table_index: '1682',
+    title: 'Prefix and Suffix Can Be the Same',
+  },
+  {
+    contest_id: 'ICPCPrelim2025',
+    task_id: '1683',
+    task_table_index: '1683',
+    title: 'Calendar of an Enthusiastic Worker',
+  },
+  {
+    contest_id: 'ICPCPrelim2025',
+    task_id: '1684',
+    task_table_index: '1684',
+    title: 'Ancient Game Board',
+  },
+  {
+    contest_id: 'ICPCPrelim2025',
+    task_id: '1685',
+    task_table_index: '1685',
+    title: 'To Be Discontinued',
+  },
+  { contest_id: 'ICPCPrelim2025', task_id: '1686', task_table_index: '1686', title: 'Dog Tricks' },
+  {
+    contest_id: 'ICPCPrelim2025',
+    task_id: '1687',
+    task_table_index: '1687',
+    title: 'Number of Faces',
+  },
+  { contest_id: 'ICPCPrelim2025', task_id: '1688', task_table_index: '1688', title: 'Parentheses' },
+  {
+    contest_id: 'ICPCPrelim2025',
+    task_id: '1689',
+    task_table_index: '1689',
+    title: 'Preparing the Lunch',
+  },
+] as TaskResults;
+
+const mixedTasks: TaskResults = [
+  ...tasks2023,
+  // ICPCPrelim2022: one problem to verify year filtering
+  {
+    contest_id: 'ICPCPrelim2022',
+    task_id: '1656',
+    task_table_index: '1656',
+    title: 'Counting Peaks of Infection',
+  },
+  // Non-ICPC contest, to verify contest-type filtering
+  { contest_id: 'abc123', task_id: 'abc123_a', task_table_index: 'A', title: 'Divisor' },
+] as TaskResults;
+
+describe('AojIcpcPrelimProvider', () => {
+  // Shared immutable instance for the primary test year — no beforeEach needed
+  const provider2023 = createProvider(2023);
+
+  describe('filter', () => {
+    describe('successful cases', () => {
+      test('returns only tasks belonging to the given year contest', () => {
+        const filtered = provider2023.filter(mixedTasks);
+
+        expect(filtered).toHaveLength(8);
+        expect(filtered.every((task) => task.contest_id === 'ICPCPrelim2023')).toBe(true);
+      });
+
+      test('excludes tasks from other ICPC years', () => {
+        const filtered = provider2023.filter(mixedTasks);
+
+        expect(filtered.some((task) => task.contest_id === 'ICPCPrelim2022')).toBe(false);
+      });
+
+      test('excludes tasks from non-ICPC contests', () => {
+        const filtered = provider2023.filter(mixedTasks);
+
+        expect(filtered.some((task) => task.contest_id === 'abc123')).toBe(false);
+      });
+    });
+
+    describe('edge cases', () => {
+      test('returns empty array for empty input', () => {
+        expect(provider2023.filter([] as TaskResults)).toEqual([]);
+      });
+
+      test('returns empty array when no tasks match the given year', () => {
+        const provider2024 = createProvider(2024);
+
+        expect(provider2024.filter(tasks2023)).toEqual([]);
+      });
+    });
+  });
+
+  describe('generateTable', () => {
+    describe('successful cases', () => {
+      test('assigns letter prefix A–H to all 8 titles in numeric ID order', () => {
+        const table = provider2023.generateTable(tasks2023);
+
+        expect(table['ICPCPrelim2023']['1664'].title).toBe(
+          'A. Which Team Should Receive the Sponsor Prize?',
+        );
+        expect(table['ICPCPrelim2023']['1665'].title).toBe('B. Amidakuji');
+        expect(table['ICPCPrelim2023']['1666'].title).toBe('C. Changing the Sitting Arrangement');
+        expect(table['ICPCPrelim2023']['1667'].title).toBe('D. Efficient Problem Set');
+        expect(table['ICPCPrelim2023']['1668'].title).toBe('E. Tampered Records');
+        expect(table['ICPCPrelim2023']['1669'].title).toBe('F. Villa of Emblem Shape');
+        expect(table['ICPCPrelim2023']['1670'].title).toBe('G. Fair Deal of Dice');
+        expect(table['ICPCPrelim2023']['1671'].title).toBe('H. Planning Locations of Bus Stops');
+      });
+
+      test('uses task_table_index as the inner key', () => {
+        const table = provider2023.generateTable(tasks2023);
+
+        expect(Object.keys(table['ICPCPrelim2023'])).toEqual(
+          expect.arrayContaining(['1664', '1665', '1666', '1667', '1668', '1669', '1670', '1671']),
+        );
+      });
+
+      test('creates table keyed by contest_id', () => {
+        const table = provider2023.generateTable(tasks2023);
+
+        expect(Object.keys(table)).toEqual(['ICPCPrelim2023']);
+      });
+
+      test('does not mutate original task data', () => {
+        const originalTitle = tasks2023[0].title;
+        provider2023.generateTable(tasks2023);
+
+        expect(tasks2023[0].title).toBe(originalTitle);
+      });
+    });
+
+    describe('edge cases', () => {
+      test('returns empty inner object when given empty input', () => {
+        const table = provider2023.generateTable([] as TaskResults);
+
+        expect(table).toEqual({ ICPCPrelim2023: {} });
+      });
+    });
+  });
+
+  describe('getMetadata', () => {
+    test('returns correct title with year', () => {
+      expect(provider2023.getMetadata().title).toBe('ICPC 国内予選 2023');
+    });
+
+    test('returns correct abbreviationName with year', () => {
+      expect(provider2023.getMetadata().abbreviationName).toBe('icpcPrelim2023');
+    });
+
+    test('returns titleFontSize as text-md', () => {
+      expect(provider2023.getMetadata().titleFontSize).toBe('text-md');
+    });
+  });
+
+  describe('getDisplayConfig', () => {
+    test('returns isShownHeader as false', () => {
+      expect(provider2023.getDisplayConfig().isShownHeader).toBe(false);
+    });
+
+    test('returns isShownRoundLabel as false', () => {
+      expect(provider2023.getDisplayConfig().isShownRoundLabel).toBe(false);
+    });
+
+    test('returns isShownTaskIndex as true', () => {
+      expect(provider2023.getDisplayConfig().isShownTaskIndex).toBe(true);
+    });
+
+    test('returns empty roundLabelWidth', () => {
+      expect(provider2023.getDisplayConfig().roundLabelWidth).toBe('');
+    });
+
+    test('returns correct tableBodyCellsWidth', () => {
+      expect(provider2023.getDisplayConfig().tableBodyCellsWidth).toBe(
+        'w-1/2 xs:w-1/3 sm:w-1/4 md:w-1/5 lg:w-1/6 px-1 py-2',
+      );
+    });
+  });
+
+  describe('getContestRoundLabel', () => {
+    test('returns label with year', () => {
+      expect(provider2023.getContestRoundLabel('ICPCPrelim2023')).toBe('ICPC 国内予選 2023');
+    });
+  });
+
+  describe('getContestRoundIds', () => {
+    test('returns contest_id of the filtered tasks', () => {
+      expect(provider2023.getContestRoundIds(tasks2023)).toEqual(['ICPCPrelim2023']);
+    });
+
+    test('returns empty array for empty input', () => {
+      expect(provider2023.getContestRoundIds([] as TaskResults)).toEqual([]);
+    });
+  });
+
+  describe('getHeaderIdsForTask', () => {
+    describe('successful cases', () => {
+      test('returns indices sorted numerically ascending regardless of input order', () => {
+        const reversedTasks = [...tasks2023].reverse() as TaskResults;
+
+        expect(provider2023.getHeaderIdsForTask(reversedTasks)).toEqual([
+          '1664',
+          '1665',
+          '1666',
+          '1667',
+          '1668',
+          '1669',
+          '1670',
+          '1671',
+        ]);
+      });
+
+      test('deduplicates repeated task_table_index values', () => {
+        const duplicateTasks = [tasks2023[0], tasks2023[0]] as TaskResults;
+
+        expect(provider2023.getHeaderIdsForTask(duplicateTasks)).toEqual(['1664']);
+      });
+    });
+
+    describe('edge cases', () => {
+      test('returns empty array for empty input', () => {
+        expect(provider2023.getHeaderIdsForTask([] as TaskResults)).toEqual([]);
+      });
+    });
+  });
+
+  describe('year boundary behavior', () => {
+    const provider1998 = createProvider(1998);
+    const provider2025 = createProvider(2025);
+
+    test('oldest year 1998 returns correct metadata (4 problems, A–D)', () => {
+      expect(provider1998.getMetadata().title).toBe('ICPC 国内予選 1998');
+      expect(provider1998.getMetadata().abbreviationName).toBe('icpcPrelim1998');
+    });
+
+    test('oldest year 1998 assigns letters A–D', () => {
+      const table = provider1998.generateTable(tasks1998);
+
+      expect(table['ICPCPrelim1998']['1100'].title).toBe('A. Area of Polygons');
+      expect(table['ICPCPrelim1998']['1101'].title).toBe('B. A Simple Offline Text Editor');
+      expect(table['ICPCPrelim1998']['1102'].title).toBe('C. Calculation of Expressions');
+      expect(table['ICPCPrelim1998']['1103'].title).toBe(
+        'D. Board Arrangements for Concentration Games',
+      );
+    });
+
+    test('oldest year 1998 filter isolates its own contest_id', () => {
+      const mixed = [...tasks1998, ...tasks2023] as TaskResults;
+      const filtered = provider1998.filter(mixed);
+
+      expect(filtered).toHaveLength(4);
+      expect(filtered.every((task) => task.contest_id === 'ICPCPrelim1998')).toBe(true);
+    });
+
+    test('latest year 2025 returns correct metadata (9 problems, A–I)', () => {
+      expect(provider2025.getMetadata().title).toBe('ICPC 国内予選 2025');
+      expect(provider2025.getMetadata().abbreviationName).toBe('icpcPrelim2025');
+    });
+
+    test('latest year 2025 assigns letters A–I (maximum problem count)', () => {
+      const table = provider2025.generateTable(tasks2025);
+
+      expect(table['ICPCPrelim2025']['1681'].title).toBe('A. 2025');
+      expect(table['ICPCPrelim2025']['1689'].title).toBe('I. Preparing the Lunch');
+    });
+
+    test('latest year 2025 filter isolates its own contest_id', () => {
+      const mixed = [...tasks2025, ...tasks2023] as TaskResults;
+      const filtered = provider2025.filter(mixed);
+
+      expect(filtered).toHaveLength(9);
+      expect(filtered.every((task) => task.contest_id === 'ICPCPrelim2025')).toBe(true);
+    });
+  });
+
+  describe('override map path', () => {
+    const TEST_YEAR = 9999;
+    const TEST_CONTEST_ID = `ICPCPrelim${TEST_YEAR}`;
+
+    const overrideTasks: TaskResults = [
+      { contest_id: TEST_CONTEST_ID, task_id: '9001', task_table_index: '9001', title: 'Task One' },
+      { contest_id: TEST_CONTEST_ID, task_id: '9002', task_table_index: '9002', title: 'Task Two' },
+    ] as TaskResults;
+
+    beforeEach(() => {
+      ICPC_PRELIM_LABEL_OVERRIDES[TEST_CONTEST_ID] = {
+        '9001': 'X',
+        '9002': 'Y',
+      };
+    });
+
+    afterEach(() => {
+      delete ICPC_PRELIM_LABEL_OVERRIDES[TEST_CONTEST_ID];
+    });
+
+    test('uses override map when ICPC_PRELIM_LABEL_OVERRIDES has an entry for the contest', () => {
+      const provider = createProvider(TEST_YEAR);
+      const table = provider.generateTable(overrideTasks);
+
+      expect(table[TEST_CONTEST_ID]['9001'].title).toBe('X. Task One');
+      expect(table[TEST_CONTEST_ID]['9002'].title).toBe('Y. Task Two');
+    });
+  });
+});
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts b/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
new file mode 100644
index 000000000..46f3ab0b9
--- /dev/null
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
@@ -0,0 +1,72 @@
+import { ContestType } from '$lib/types/contest';
+import type { TaskResult, TaskResults } from '$lib/types/task';
+import {
+  type ContestTableMetaData,
+  type ContestTableDisplayConfig,
+  type ContestTable,
+} from '$features/tasks/types/contest-table/contest_table_provider';
+
+import { ContestTableProviderBase } from './contest_table_provider_base';
+import { buildAojIcpcLetterMap } from './aoj_icpc_labels';
+
+export class AojIcpcPrelimProvider extends ContestTableProviderBase {
+  private readonly year: number;
+  private readonly contestId: string;
+
+  constructor(contestType: ContestType, year: number) {
+    super(contestType, String(year)); // provider key: AOJ_ICPC::2025
+    this.year = year;
+    this.contestId = `ICPCPrelim${year}`;
+  }
+
+  protected setFilterCondition(): (taskResult: TaskResult) => boolean {
+    return (taskResult: TaskResult) => taskResult.contest_id === this.contestId;
+  }
+
+  // Override: prepend assigned letter to the title (display only; DB unchanged).
+  // ICPC titles are stored as "{name}" only, so no prefix removal is needed.
+  generateTable(filtered: TaskResults): ContestTable {
+    const letterMap = buildAojIcpcLetterMap(
+      this.contestId,
+      filtered.map((taskResult) => taskResult.task_table_index),
+    );
+    const table: ContestTable = { [this.contestId]: {} };
+
+    for (const taskResult of filtered) {
+      const index = taskResult.task_table_index;
+      const letter = letterMap.get(index) ?? index;
+      table[this.contestId][index] = { ...taskResult, title: `${letter}. ${taskResult.title}` };
+    }
+
+    return table;
+  }
+
+  // Ensure left-to-right cell order is numeric (A,B,C...). Safeguard for variable-width ids.
+  getHeaderIdsForTask(filtered: TaskResults): string[] {
+    return Array.from(new Set(filtered.map((taskResult) => taskResult.task_table_index))).sort(
+      (first, second) => Number(first) - Number(second),
+    );
+  }
+
+  getMetadata(): ContestTableMetaData {
+    return {
+      title: `ICPC 国内予選 ${this.year}`,
+      abbreviationName: `icpcPrelim${this.year}`,
+      titleFontSize: 'text-md',
+    };
+  }
+
+  getDisplayConfig(): ContestTableDisplayConfig {
+    return {
+      isShownHeader: false,
+      isShownRoundLabel: false,
+      roundLabelWidth: '',
+      tableBodyCellsWidth: 'w-1/2 xs:w-1/3 sm:w-1/4 md:w-1/5 lg:w-1/6 px-1 py-2',
+      isShownTaskIndex: true,
+    };
+  }
+
+  getContestRoundLabel(_contestId: string): string {
+    return `ICPC 国内予選 ${this.year}`;
+  }
+}
diff --git a/src/features/tasks/utils/contest-table/contest_table_provider.ts b/src/features/tasks/utils/contest-table/contest_table_provider.ts
index 0fa0e7988..4c4f64f46 100644
--- a/src/features/tasks/utils/contest-table/contest_table_provider.ts
+++ b/src/features/tasks/utils/contest-table/contest_table_provider.ts
@@ -14,3 +14,5 @@ export * from './dp_providers';
 export * from './fps24_provider';
 export * from './acl_providers';
 export * from './joi_providers';
+export * from './aoj_icpc_providers';
+export * from './aoj_icpc_labels';
diff --git a/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts b/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts
index 135080c95..d8d0f1d55 100644
--- a/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts
+++ b/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts
@@ -31,10 +31,13 @@ import {
   TessokuBookForPracticalsProvider,
   TessokuBookForChallengesProvider,
   MathAndAlgorithmProvider,
+  AojIcpcPrelimProvider,
   prepareContestProviderPresets,
 } from './contest_table_provider';
 import { TESSOKU_SECTIONS } from '$features/tasks/types/contest-table/contest_table_provider';
 
+import { ICPC_PRELIM_OLDEST_YEAR, ICPC_PRELIM_LATEST_YEAR } from './contest_table_provider_groups';
+
 describe('prepareContestProviderPresets', () => {
   test('expects to create ABS preset correctly', () => {
     const group = prepareContestProviderPresets().ABS();
@@ -287,6 +290,18 @@ describe('prepareContestProviderPresets', () => {
     );
   });
 
+  test('expects to create AojIcpcPrelim preset correctly', () => {
+    const group = prepareContestProviderPresets().AojIcpcPrelim();
+
+    expect(group.getGroupName()).toBe('ICPC 国内予選');
+    expect(group.getMetadata()).toEqual({
+      buttonLabel: 'ICPC 国内予選',
+      ariaLabel: 'Filter ICPC Domestic Preliminary',
+    });
+    expect(group.getSize()).toBe(ICPC_PRELIM_LATEST_YEAR - ICPC_PRELIM_OLDEST_YEAR + 1); // 28
+    expect(group.getProvider(ContestType.AOJ_ICPC, '2023')).toBeInstanceOf(AojIcpcPrelimProvider);
+  });
+
   test('expects to verify all presets are functions', () => {
     const presets = prepareContestProviderPresets();
 
@@ -309,6 +324,7 @@ describe('prepareContestProviderPresets', () => {
     expect(typeof presets.Acl).toBe('function');
     expect(typeof presets.JOIFirstQualRound).toBe('function');
     expect(typeof presets.JOISecondQualAndSemiFinalRound).toBe('function');
+    expect(typeof presets.AojIcpcPrelim).toBe('function');
   });
 
   test('expects each preset to create independent instances', () => {
diff --git a/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts b/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts
index dd2cbb162..5bde6224d 100644
--- a/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts
+++ b/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts
@@ -32,8 +32,12 @@ import {
   JOIQualRoundFrom2006To2019Provider,
   JOISemiFinalRoundProvider,
 } from './joi_providers';
+import { AojIcpcPrelimProvider } from './aoj_icpc_providers';
 import { ContestTableProviderGroup } from './contest_table_provider_group';
 
+export const ICPC_PRELIM_OLDEST_YEAR = 1998;
+export const ICPC_PRELIM_LATEST_YEAR = 2025;
+
 /**
  * Prepare predefined provider groups
  * Easily create groups with commonly used combinations
@@ -224,6 +228,19 @@ export const prepareContestProviderPresets = () => {
         new JOIQualRoundFrom2006To2019Provider(ContestType.JOI),
         new JOISemiFinalRoundProvider(ContestType.JOI),
       ),
+
+    AojIcpcPrelim: () => {
+      const group = new ContestTableProviderGroup('ICPC 国内予選', {
+        buttonLabel: 'ICPC 国内予選',
+        ariaLabel: 'Filter ICPC Domestic Preliminary',
+      });
+      // Iterate from latest to oldest so the newest year's table renders on top.
+      for (let year = ICPC_PRELIM_LATEST_YEAR; year >= ICPC_PRELIM_OLDEST_YEAR; year--) {
+        group.addProvider(new AojIcpcPrelimProvider(ContestType.AOJ_ICPC, year));
+      }
+
+      return group;
+    },
   };
 };
 
@@ -249,6 +266,7 @@ export const contestTableProviderGroups = {
   acl: presets.Acl(),
   joiFirstQualRound: presets.JOIFirstQualRound(),
   joiSecondQualAndSemiFinalRound: presets.JOISecondQualAndSemiFinalRound(),
+  aojIcpcPrelim: presets.AojIcpcPrelim(),
 };
 
 export type ContestTableProviderGroups = keyof typeof contestTableProviderGroups;

From afa14b18417de0dd73147ee95c8897d7f75dad7d Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 11:42:47 +0000
Subject: [PATCH 2/7] docs(types): update titleFontSize TSDoc example to
 text-md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../tasks/types/contest-table/contest_table_provider.ts         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/features/tasks/types/contest-table/contest_table_provider.ts b/src/features/tasks/types/contest-table/contest_table_provider.ts
index cd174e64a..c3d22fae2 100644
--- a/src/features/tasks/types/contest-table/contest_table_provider.ts
+++ b/src/features/tasks/types/contest-table/contest_table_provider.ts
@@ -127,7 +127,7 @@ export type ContestTable = Record<string, Record<string, TaskResult>>;
  * @typedef {Object} ContestTableMetaData
  * @property {string} title - The title text to display for the contest table.
  * @property {string} abbreviationName - Contest abbreviation, used for map keys.
- * @property {string} [titleFontSize] - Tailwind class for title font size, e.g. 'text-xl'. Defaults to 'text-2xl' at render.
+ * @property {string} [titleFontSize] - Tailwind class for title font size, e.g. 'text-md'. Defaults to 'text-2xl' at render.
  */
 export type ContestTableMetaData = {
   title: string;

From d9105dd8422c1a50f9498ebcb63aba766087e97a Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 12:16:22 +0000
Subject: [PATCH 3/7] feat(contest): add ContestTableTitleStyle type and group
 mainTitle heading
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replace the single titleFontSize field with a ContestTableTitleStyle struct
(headingTag, fontSize, fontWeight, bottomGap) to allow per-provider heading
customisation. Add optional mainTitle to ContestTablesMetaData and render it
as an h2 above the provider list in TaskTable; set it to 'ICPC 国内予選' for
the ICPC Prelim group.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../components/contest-table/TaskTable.svelte | 13 ++++++++--
 .../contest-table/contest_table_provider.ts   | 24 +++++++++++++++++--
 .../contest-table/aoj_icpc_providers.test.ts  |  9 +++++--
 .../utils/contest-table/aoj_icpc_providers.ts |  7 +++++-
 .../contest_table_provider_groups.test.ts     |  1 +
 .../contest_table_provider_groups.ts          |  1 +
 6 files changed, 48 insertions(+), 7 deletions(-)

diff --git a/src/features/tasks/components/contest-table/TaskTable.svelte b/src/features/tasks/components/contest-table/TaskTable.svelte
index c3048c395..620cfb33d 100644
--- a/src/features/tasks/components/contest-table/TaskTable.svelte
+++ b/src/features/tasks/components/contest-table/TaskTable.svelte
@@ -56,6 +56,7 @@
     contestTableProviderGroups[activeContestType as ContestTableProviderGroups],
   );
   let providers = $derived(providerGroups?.getAllProviders() ?? []);
+  let groupMetadata = $derived(providerGroups?.getMetadata());
 
   interface ProviderData {
     filteredTaskResults: TaskResults;
@@ -214,6 +215,13 @@
   </div>
 </div>
 
+<!-- Group-level main heading: rendered once above all providers when opted in. -->
+{#if groupMetadata?.mainTitle}
+  <Heading tag="h2" class="text-2xl pb-3 text-gray-900 dark:text-white">
+    {groupMetadata.mainTitle}
+  </Heading>
+{/if}
+
 <!-- TODO: ページネーションを実装 -->
 <!-- See: -->
 <!-- https://github.com/kenkoooo/AtCoderProblems/blob/master/atcoder-problems-frontend/src/pages/TablePage/AtCoderRegularTable.tsx -->
@@ -225,8 +233,9 @@
 
   <!-- Title -->
   <Heading
-    tag="h2"
-    class="{metadata.titleFontSize ?? 'text-2xl'} pb-3 text-gray-900 dark:text-white"
+    tag={metadata.titleStyle?.headingTag ?? 'h2'}
+    class="{metadata.titleStyle?.fontSize ?? 'text-2xl'} {metadata.titleStyle?.bottomGap ??
+      'pb-3'} {metadata.titleStyle?.fontWeight ?? ''} text-gray-900 dark:text-white"
   >
     {metadata.title}
   </Heading>
diff --git a/src/features/tasks/types/contest-table/contest_table_provider.ts b/src/features/tasks/types/contest-table/contest_table_provider.ts
index c3d22fae2..1214a0188 100644
--- a/src/features/tasks/types/contest-table/contest_table_provider.ts
+++ b/src/features/tasks/types/contest-table/contest_table_provider.ts
@@ -127,12 +127,30 @@ export type ContestTable = Record<string, Record<string, TaskResult>>;
  * @typedef {Object} ContestTableMetaData
  * @property {string} title - The title text to display for the contest table.
  * @property {string} abbreviationName - Contest abbreviation, used for map keys.
- * @property {string} [titleFontSize] - Tailwind class for title font size, e.g. 'text-md'. Defaults to 'text-2xl' at render.
+ * @property {ContestTableTitleStyle} [titleStyle] - Title heading style overrides. Defaults applied at render.
  */
 export type ContestTableMetaData = {
   title: string;
   abbreviationName: string;
-  titleFontSize?: string;
+  titleStyle?: ContestTableTitleStyle;
+};
+
+/**
+ * Visual style for a contest table's title heading.
+ *
+ * Each field is optional; the renderer applies the noted default when unset.
+ *
+ * @typedef {Object} ContestTableTitleStyle
+ * @property {'h2' | 'h3'} [headingTag] - Heading element tag. Defaults to 'h2' at render.
+ * @property {string} [fontSize] - Tailwind font-size class, e.g. 'text-md'. Defaults to 'text-2xl' at render.
+ * @property {string} [fontWeight] - Tailwind font-weight class, e.g. 'font-normal'. Defaults to Flowbite Heading default (bold).
+ * @property {string} [bottomGap] - Tailwind padding-bottom class, e.g. 'pb-1'. Defaults to 'pb-3' at render.
+ */
+export type ContestTableTitleStyle = {
+  headingTag?: 'h2' | 'h3';
+  fontSize?: string;
+  fontWeight?: string;
+  bottomGap?: string;
 };
 
 /**
@@ -141,10 +159,12 @@ export type ContestTableMetaData = {
  * @typeof {Object} ContestTablesMetaData
  * @property {string} buttonLabel - The text to display on the contest table's primary action button.
  * @property {string} ariaLabel - Accessibility label for screen readers describing the contest table.
+ * @property {string} [mainTitle] - Group-level heading rendered once above the providers (opt-in). Not rendered when unset.
  */
 export type ContestTablesMetaData = {
   buttonLabel: string;
   ariaLabel: string;
+  mainTitle?: string;
 };
 
 /**
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts b/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
index 78ae26930..5b3c93cc5 100644
--- a/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
@@ -235,8 +235,13 @@ describe('AojIcpcPrelimProvider', () => {
       expect(provider2023.getMetadata().abbreviationName).toBe('icpcPrelim2023');
     });
 
-    test('returns titleFontSize as text-md', () => {
-      expect(provider2023.getMetadata().titleFontSize).toBe('text-md');
+    test('returns titleStyle with text-md font size, pb-2 bottom gap, and h3 heading tag', () => {
+      expect(provider2023.getMetadata().titleStyle).toEqual({
+        headingTag: 'h3',
+        fontSize: 'text-md',
+        fontWeight: 'font-normal',
+        bottomGap: 'pb-1',
+      });
     });
   });
 
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts b/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
index 46f3ab0b9..182c90ddf 100644
--- a/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
@@ -52,7 +52,12 @@ export class AojIcpcPrelimProvider extends ContestTableProviderBase {
     return {
       title: `ICPC 国内予選 ${this.year}`,
       abbreviationName: `icpcPrelim${this.year}`,
-      titleFontSize: 'text-md',
+      titleStyle: {
+        headingTag: 'h3',
+        fontSize: 'text-md',
+        fontWeight: 'font-normal',
+        bottomGap: 'pb-1',
+      },
     };
   }
 
diff --git a/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts b/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts
index d8d0f1d55..d5a08b324 100644
--- a/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts
+++ b/src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts
@@ -297,6 +297,7 @@ describe('prepareContestProviderPresets', () => {
     expect(group.getMetadata()).toEqual({
       buttonLabel: 'ICPC 国内予選',
       ariaLabel: 'Filter ICPC Domestic Preliminary',
+      mainTitle: 'ICPC 国内予選',
     });
     expect(group.getSize()).toBe(ICPC_PRELIM_LATEST_YEAR - ICPC_PRELIM_OLDEST_YEAR + 1); // 28
     expect(group.getProvider(ContestType.AOJ_ICPC, '2023')).toBeInstanceOf(AojIcpcPrelimProvider);
diff --git a/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts b/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts
index 5bde6224d..6e39c0c46 100644
--- a/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts
+++ b/src/features/tasks/utils/contest-table/contest_table_provider_groups.ts
@@ -233,6 +233,7 @@ export const prepareContestProviderPresets = () => {
       const group = new ContestTableProviderGroup('ICPC 国内予選', {
         buttonLabel: 'ICPC 国内予選',
         ariaLabel: 'Filter ICPC Domestic Preliminary',
+        mainTitle: 'ICPC 国内予選',
       });
       // Iterate from latest to oldest so the newest year's table renders on top.
       for (let year = ICPC_PRELIM_LATEST_YEAR; year >= ICPC_PRELIM_OLDEST_YEAR; year--) {

From 08d0f8746d9b189f777219e27e1c335e971b6058 Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 12:32:15 +0000
Subject: [PATCH 4/7] docs: add Pattern 4 (constructor-parameter provider) to
 rules, skill, and guide

Document lessons from the ICPC Prelim implementation: {@const} placement
restriction in Svelte templates, mutable module-level export testing pattern,
and the full Pattern 4 checklist covering year-range constants, generateTable/
getHeaderIdsForTask key alignment, override map testing, titleStyle, and
mainTitle.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .claude/rules/svelte-components.md            | 19 ++++++
 .claude/rules/testing.md                      | 19 ++++++
 .../instructions.md                           | 23 ++++++-
 .../how-to-add-contest-table-provider.md      | 61 +++++++++++++++++++
 4 files changed, 121 insertions(+), 1 deletion(-)

diff --git a/.claude/rules/svelte-components.md b/.claude/rules/svelte-components.md
index bcb24da19..6f354556b 100644
--- a/.claude/rules/svelte-components.md
+++ b/.claude/rules/svelte-components.md
@@ -83,6 +83,25 @@ Import from `flowbite-svelte`. Use Tailwind v4 `dark:` prefix. When copying butt
 - Move business logic to `_utils/` or `utils/` with tests
 - Keep components thin: one responsibility
 
+## `{@const}` Placement Restriction
+
+`{@const}` is only valid as the immediate child of a control-flow block (`{#if}`, `{#each}`, `{:else}`, etc.) — placing it at the template top level is a compile error.
+
+When you need a derived value in both a `{#if}` condition and its body, declare it with `$derived` in `<script>` instead:
+
+```typescript
+// ✅ in <script>
+let groupMetadata = $derived(store?.getMetadata());
+```
+
+```svelte
+{#if groupMetadata?.mainTitle}
+  <Heading>{groupMetadata.mainTitle}</Heading>
+{/if}
+```
+
+This also avoids calling the getter twice per render.
+
 ## Reactive Data Pitfalls
 
 - `let` captures initial value only; use `$derived` for derived/prop data
diff --git a/.claude/rules/testing.md b/.claude/rules/testing.md
index 10b77dea0..39620b2f1 100644
--- a/.claude/rules/testing.md
+++ b/.claude/rules/testing.md
@@ -112,6 +112,25 @@ afterEach(() => {
 });
 ```
 
+### Mutable Module-Level Exports
+
+When a module exports a mutable `const` object (e.g. an override map), mutate it directly in `beforeEach`/`afterEach` to test override paths — no `vi.mock` needed:
+
+```typescript
+import { buildFn, OVERRIDE_MAP } from './module';
+
+beforeEach(() => {
+  OVERRIDE_MAP['testKey'] = { '100': 'A', '102': 'C' };
+});
+afterEach(() => {
+  delete OVERRIDE_MAP['testKey'];
+});
+
+test('uses override map when entry exists', () => {
+  expect(buildFn('testKey', ['100', '102']).get('100')).toBe('A');
+});
+```
+
 ### Test Stubs
 
 Parameter types **must match** production signature — use domain types (`TaskGrade`), not `string`. Mismatch compiles silently but breaks type safety.
diff --git a/.claude/skills/add-contest-table-provider/instructions.md b/.claude/skills/add-contest-table-provider/instructions.md
index 28bdce16f..e5608c686 100644
--- a/.claude/skills/add-contest-table-provider/instructions.md
+++ b/.claude/skills/add-contest-table-provider/instructions.md
@@ -14,6 +14,7 @@ Step 0 (seed check) is already done. Confirm the following before touching code:
   - Pattern 1: numeric range filter (e.g. ABC 001–041)
   - Pattern 2: single fixed contest_id (e.g. NDPC, TDPC, FPS_24)
   - Pattern 3: multiple contest_ids unified in one table (e.g. ABS, ABC-Like)
+  - Pattern 4: one class instantiated N times via constructor parameter (e.g. ICPC Prelim by year)
 - Nearest neighbor ContestType for insertion order in `contestTypePriorities`?
 - New group or merge into existing? If new: group name / `buttonLabel` / `ariaLabel`?
 
@@ -23,6 +24,15 @@ Step 0 (seed check) is already done. Confirm the following before touching code:
 - Shared problems with another contest (e.g. ARC–ABC overlap)? Which contest_ids appear in both?
 - Round label format (e.g. `ABC 042`)?
 
+**Pattern 4 additional:**
+
+- Constructor parameter name and type (e.g. `year: number`)?
+- Year/ID range: oldest and latest? Export both as named constants so tests can reference them.
+- Iteration order: latest-first so newest table renders on top.
+- `task_table_index` values numeric strings? → override `getHeaderIdsForTask` with `Number(a) - Number(b)` sort.
+- `generateTable` needs display-only title transform (e.g. prepend letter)? → override it AND override `getHeaderIdsForTask` using the same key derivation — mismatched keys between the two methods cause missing cells.
+- Edge cases where the default algorithm breaks? → add a `Record<string, Record<string, string>>` override map; populate it per contest_id; test the override path with `beforeEach`/`afterEach` mutation.
+
 **Pattern 3 additional:**
 
 - Show the full contest_id list found in `prisma/tasks.ts` — any missing or to exclude?
@@ -87,6 +97,16 @@ Step 0 (seed check) is already done. Confirm the following before touching code:
 - [ ] Implement Provider using `parseContestRound()` range check
 - [ ] `pnpm test:unit <providers.test.ts>` — **expect GREEN**
 
+### Pattern 4: N-instances via constructor parameter
+
+- [ ] Export `OLDEST_YEAR` / `LATEST_YEAR` constants (module-level, before `prepareContestProviderPresets`) so tests can assert `getSize() === LATEST - OLDEST + 1`
+- [ ] Pass the parameter as `section` in `super(contestType, String(param))` → provider key becomes `TYPE::value` (unique per instance)
+- [ ] If `generateTable` is overridden to key the table by `task_table_index` directly: also override `getHeaderIdsForTask` using the same field and sort order
+- [ ] If display title needs transformation (e.g. prepend "A. "): do it inside `generateTable`; DB data must remain unchanged
+- [ ] Write override map (`Record<string, Record<string, value>>`) for known edge cases; test the override path by mutating the export in `beforeEach` and cleaning up in `afterEach`
+- [ ] If provider headings need non-default font/weight/gap: return `titleStyle` (`headingTag` / `fontSize` / `fontWeight` / `bottomGap`) from `getMetadata()`; include all set fields in the `titleStyle` assertion
+- [ ] `pnpm test:unit <providers.test.ts>` — **expect GREEN**
+
 ### Pattern 3: composite
 
 - [ ] Confirm whether `prisma/contest_task_pairs.ts` needs new entries before writing tests
@@ -101,7 +121,7 @@ Step 0 (seed check) is already done. Confirm the following before touching code:
 ## Layer 5 — Group registration (TDD)
 
 - [ ] Update `contest_table_provider_groups.test.ts`:
-  - New group name string, `buttonLabel`, `ariaLabel`
+  - New group name string, `buttonLabel`, `ariaLabel` (add `mainTitle` if used)
   - `getSize()` incremented to reflect the new provider count
   - Add `getProvider(ContestType.XXX)` assertion
   - Add import of new Provider class
@@ -109,6 +129,7 @@ Step 0 (seed check) is already done. Confirm the following before touching code:
 - [ ] Update `contest_table_provider_groups.ts`:
   - Add import of new Provider class
   - Update group name string, `buttonLabel`, `ariaLabel`
+  - Add `mainTitle: 'XXX'` if the group needs a single h2 heading rendered above all providers (opt-in; omit when not needed)
   - Add `new XXXProvider(ContestType.XXX)` to `addProviders()`
 - [ ] `pnpm test:unit src/features/tasks/utils/contest-table/` — **expect GREEN**
 
diff --git a/docs/guides/how-to-add-contest-table-provider.md b/docs/guides/how-to-add-contest-table-provider.md
index cbf5dd60e..53e2e2529 100644
--- a/docs/guides/how-to-add-contest-table-provider.md
+++ b/docs/guides/how-to-add-contest-table-provider.md
@@ -33,6 +33,7 @@
   - **パターン1（範囲フィルタ型）**: ABC 001～041、ARC 058～103 など → 数値範囲でフィルタ
   - **パターン2（単一ソース型）**: EDPC、TDPC、ACL_PRACTICE など → 単一 contest_id のみ
   - **パターン3（複合ソース型）**: ABS、ABC-Like など → 複数 contest_id を統一表示
+  - **パターン4（コンストラクタパラメータ型）**: ICPC 国内予選など → 1クラスをコンストラクタ引数（年度等）で N 回インスタンス化
   - 対応セクション: [実装パターン](#実装パターン)
 
 - [ ] **JOI の contest_id サフィックス変更の確認**
@@ -192,6 +193,66 @@ protected setFilterCondition(): (taskResult: TaskResult) => boolean {
 
 ---
 
+### パターン4: コンストラクタパラメータ型（ICPC 国内予選）
+
+**特徴**:
+
+- 年度などのパラメータを受け取る1つのクラスを N 回インスタンス化
+- `super(contestType, String(year))` でセクションを年度文字列にし、プロバイダキーを `AOJ_ICPC::2025` のように一意化
+- 年度範囲定数（`OLDEST_YEAR` / `LATEST_YEAR`）をモジュールトップで `export` し、tests でも参照できるようにする
+- グループ登録時は最新年から古い年へ降順ループし、テーブルを新しい順に並べる
+
+**実装例**:
+
+```typescript
+export const ICPC_PRELIM_OLDEST_YEAR = 1998;
+export const ICPC_PRELIM_LATEST_YEAR = 2025;
+
+export class AojIcpcPrelimProvider extends ContestTableProviderBase {
+  private readonly year: number;
+  private readonly contestId: string;
+
+  constructor(contestType: ContestType, year: number) {
+    super(contestType, String(year)); // provider key: AOJ_ICPC::2025
+    this.year = year;
+    this.contestId = `ICPCPrelim${year}`;
+  }
+  // ...
+}
+
+// グループ登録（最新年が上に来るよう降順）
+for (let year = ICPC_PRELIM_LATEST_YEAR; year >= ICPC_PRELIM_OLDEST_YEAR; year--) {
+  group.addProvider(new AojIcpcPrelimProvider(ContestType.AOJ_ICPC, year));
+}
+```
+
+**注意**:
+
+- `generateTable` をオーバーライドして `task_table_index` をキーにする場合、`getHeaderIdsForTask` も**必ず同じフィールド・同じソート順**でオーバーライドすること。ベースクラスの `getHeaderIdsForTask` は `getTaskTableHeaderName()` 経由でキーを導出するため、`generateTable` と一致しないとセルが表示されない。
+- `task_table_index` が数値文字列（例: `'1664'`）の場合、辞書順ではなく数値昇順ソートが必要: `Number(a) - Number(b)`
+- アルゴリズムが成立しない例外年度には上書き Map を用意する:
+
+```typescript
+// contest_id -> (task_table_index -> letter). Used only for years with judge gaps.
+export const ICPC_PRELIM_LABEL_OVERRIDES: Record<string, Record<string, string>> = {};
+```
+
+上書き Map のテストは `beforeEach`/`afterEach` でエントリを直接追加・削除する（`vi.mock` 不要）:
+
+```typescript
+beforeEach(() => {
+  ICPC_PRELIM_LABEL_OVERRIDES['ICPCPrelimTest'] = { '1150': 'A', '1152': 'C' };
+});
+afterEach(() => {
+  delete ICPC_PRELIM_LABEL_OVERRIDES['ICPCPrelimTest'];
+});
+```
+
+- グループ全体に一度だけ大見出し（h2）を表示したい場合は、グループ登録時に `mainTitle: 'XXX'` を追加する。省略すると描画されない。個々の provider の `title` が冗長になるなら年や回だけに絞っても良い（ICPC 国内予選は敢えて重複させた）。
+- provider 見出しのフォント・太字・余白をデフォルトから変えたい場合は `getMetadata()` で `titleStyle` を返す。`ContestTableTitleStyle`（`headingTag` / `fontSize` / `fontWeight` / `bottomGap`）のうち必要なフィールドだけ指定すればよい。
+
+---
+
 ### パターン3: 複合ソース型（ABS / TESSOKU_BOOK / MATH_AND_ALGORITHM）
 
 **特徴**:

From 967917bfabd28ce793119201c32428da5f9184cc Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 12:32:52 +0000
Subject: [PATCH 5/7] docs: add plan-2nd.md for ICPC Prelim table UI and
 metadata hierarchy refactor

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../aoj-icpc-prelim-table/plan-2nd.md         | 114 ++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md

diff --git a/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md b/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md
new file mode 100644
index 000000000..027629c23
--- /dev/null
+++ b/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md
@@ -0,0 +1,114 @@
+# aojIcpcPrelim テーブル UI 調整 + メタデータ階層整理
+
+## Context（背景）
+
+ICPC 国内予選テーブル（#3633, 年度ごとに 28 テーブル）の表示を微調整したい。具体的には:
+
+1. **各年サブ見出し（例「ICPC 国内予選 2025」）とテーブルの隙間を狭めたい**（現状 `pb-3` ハードコード）。
+2. **グループ先頭に1回だけメイン見出し「ICPC 国内予選」を h2 で入れたい**。他グループはメイン見出しを持たない（opt-in）。
+
+これらを足すと、1文字違いで紛らわしい `ContestTableMetaData`（プロバイダ単位）/ `ContestTablesMetaData`（グループ単位）に optional フィールドが散らばり dirty になる。そこで **タイトル系スタイルを `titleStyle` オブジェクトに集約**し、メイン見出しはグループ単位メタデータに追加して階層を整理する。
+
+`titleFontSize?` はこの未マージブランチで新規追加されたフィールドのため、後方互換を考えず `titleStyle` へ移行する（YAGNI）。
+
+## 設計
+
+### メタデータ型（`contest_table_provider.ts`）
+
+```typescript
+// タイトル表示スタイル（プロバイダ単位）
+export type ContestTableTitleStyle = {
+  fontSize?: string; // Tailwind, default 'text-2xl'
+  bottomGap?: string; // Tailwind padding-bottom, default 'pb-3'
+  headingTag?: 'h2' | 'h3'; // default 'h2'
+};
+
+// プロバイダ単位（titleFontSize? を titleStyle? に置換）
+export type ContestTableMetaData = {
+  title: string;
+  abbreviationName: string;
+  titleStyle?: ContestTableTitleStyle;
+};
+
+// グループ単位（mainTitle? を追加）
+export type ContestTablesMetaData = {
+  buttonLabel: string;
+  ariaLabel: string;
+  mainTitle?: string; // グループ先頭に1回だけ h2 で表示。未指定なら描画しない
+};
+```
+
+TSDoc も `titleFontSize` 記述を `titleStyle` に更新。
+
+### レンダリング（`TaskTable.svelte`）
+
+1. ボタン群（L197-215）と provider ループ（L222-）の **間** にグループメイン見出しを1回描画:
+
+```svelte
+{@const groupMetadata = providerGroups?.getMetadata()}
+
+{#if groupMetadata?.mainTitle}
+  <Heading tag="h2" class="text-2xl pb-3 text-gray-900 dark:text-white">
+    {groupMetadata.mainTitle}
+  </Heading>
+{/if}
+```
+
+2. provider ごとの見出し（L227-232）を `titleStyle` 参照に変更（フォールバックでデフォルト維持）:
+
+```svelte
+<Heading
+  tag={metadata.titleStyle?.headingTag ?? 'h2'}
+  class="{metadata.titleStyle?.fontSize ?? 'text-2xl'} {metadata.titleStyle?.bottomGap ??
+    'pb-3'} text-gray-900 dark:text-white"
+>
+  {metadata.title}
+</Heading>
+```
+
+→ ICPC は メイン h2「ICPC 国内予選」、各年 h3「YYYY」(text-md, pb-2)。他グループは従来どおり h2 / text-2xl / pb-3。
+
+> **決定（user）**: メイン見出しと各年見出しで「ICPC 国内予選」が二重表示になるのを避けるため、各年見出しは年のみ（例「2025」）に短縮する。`getMetadata().title` を `String(year)` へ変更。`getContestRoundLabel` は `isShownRoundLabel: false` のため非表示で、変更不要。
+
+### プロバイダ（`aoj_icpc_providers.ts`）
+
+`getMetadata()` を変更:
+
+```typescript
+title: `${this.year}`, // 年のみ（メイン見出しとの二重表示を回避）
+titleStyle: { fontSize: 'text-md', bottomGap: 'pb-2', headingTag: 'h3' },
+```
+
+### グループ登録（`contest_table_provider_groups.ts`）
+
+`AojIcpcPrelim` グループの metadata に `mainTitle: 'ICPC 国内予選'` を追加。
+
+## 変更ファイル
+
+| ファイル                                                                  | 変更                                                                                                                                  |
+| ------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
+| `src/features/tasks/types/contest-table/contest_table_provider.ts`        | `ContestTableTitleStyle` 追加 / `ContestTableMetaData.titleFontSize` → `titleStyle` / `ContestTablesMetaData.mainTitle?` 追加 / TSDoc |
+| `src/features/tasks/utils/contest-table/aoj_icpc_providers.ts`            | `getMetadata()` を `titleStyle` に移行                                                                                                |
+| `src/features/tasks/utils/contest-table/contest_table_provider_groups.ts` | `AojIcpcPrelim` に `mainTitle` 追加                                                                                                   |
+| `src/features/tasks/components/contest-table/TaskTable.svelte`            | グループメイン見出し描画 + provider 見出しを `titleStyle` 参照に                                                                      |
+
+## テスト（TDD: 先にテスト更新 → red → 実装 → green）
+
+- **`aoj_icpc_providers.test.ts`**:
+  - `title` を assert している箇所（L230-232）を年のみ（`'2023'`）に更新。
+  - `titleFontSize` を assert している箇所（L238-240）を `titleStyle` に更新:
+    - `getMetadata().titleStyle.fontSize === 'text-md'`
+    - `getMetadata().titleStyle.bottomGap === 'pb-2'`
+    - `getMetadata().titleStyle.headingTag === 'h3'`
+- **`contest_table_provider_groups.test.ts`**: `AojIcpcPrelim` の `getMetadata()` toEqual に `mainTitle: 'ICPC 国内予選'` を追加（L294-297）。
+- 型変更はテストファースト対象外（testing.md の TDD 例外）。
+- `TaskTable.svelte` の変更はテンプレート表示のみ（`??` フォールバック）。Vitest は省略し E2E / 手動で確認（svelte-components.md / testing.md のコンポーネント方針に準拠）。
+
+## 検証
+
+1. `pnpm test:unit src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts` → green
+2. `pnpm check`（型整合）/ `pnpm lint`
+3. `pnpm dev` で目視:
+   - ICPC 国内予選ボタン押下 → 先頭に h2「ICPC 国内予選」が1回表示
+   - 各年見出しが h3 / text-md / 隙間 pb-2（やや狭い）
+   - 他グループ（ABC, EDPC 等）はメイン見出しなし・従来の h2/text-2xl/pb-3 のまま（リグレッションなし）

From 9ed1dbaafc49b61db683bb351eff128367ac5e98 Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 12:34:04 +0000
Subject: [PATCH 6/7] docs: remove ICPC Prelim dev-notes after implementation
 complete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../aoj-icpc-prelim-table/plan-2nd.md         | 114 --------
 .../2026-06-10/aoj-icpc-prelim-table/plan.md  | 248 ------------------
 2 files changed, 362 deletions(-)
 delete mode 100644 docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md
 delete mode 100644 docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md

diff --git a/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md b/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md
deleted file mode 100644
index 027629c23..000000000
--- a/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan-2nd.md
+++ /dev/null
@@ -1,114 +0,0 @@
-# aojIcpcPrelim テーブル UI 調整 + メタデータ階層整理
-
-## Context（背景）
-
-ICPC 国内予選テーブル（#3633, 年度ごとに 28 テーブル）の表示を微調整したい。具体的には:
-
-1. **各年サブ見出し（例「ICPC 国内予選 2025」）とテーブルの隙間を狭めたい**（現状 `pb-3` ハードコード）。
-2. **グループ先頭に1回だけメイン見出し「ICPC 国内予選」を h2 で入れたい**。他グループはメイン見出しを持たない（opt-in）。
-
-これらを足すと、1文字違いで紛らわしい `ContestTableMetaData`（プロバイダ単位）/ `ContestTablesMetaData`（グループ単位）に optional フィールドが散らばり dirty になる。そこで **タイトル系スタイルを `titleStyle` オブジェクトに集約**し、メイン見出しはグループ単位メタデータに追加して階層を整理する。
-
-`titleFontSize?` はこの未マージブランチで新規追加されたフィールドのため、後方互換を考えず `titleStyle` へ移行する（YAGNI）。
-
-## 設計
-
-### メタデータ型（`contest_table_provider.ts`）
-
-```typescript
-// タイトル表示スタイル（プロバイダ単位）
-export type ContestTableTitleStyle = {
-  fontSize?: string; // Tailwind, default 'text-2xl'
-  bottomGap?: string; // Tailwind padding-bottom, default 'pb-3'
-  headingTag?: 'h2' | 'h3'; // default 'h2'
-};
-
-// プロバイダ単位（titleFontSize? を titleStyle? に置換）
-export type ContestTableMetaData = {
-  title: string;
-  abbreviationName: string;
-  titleStyle?: ContestTableTitleStyle;
-};
-
-// グループ単位（mainTitle? を追加）
-export type ContestTablesMetaData = {
-  buttonLabel: string;
-  ariaLabel: string;
-  mainTitle?: string; // グループ先頭に1回だけ h2 で表示。未指定なら描画しない
-};
-```
-
-TSDoc も `titleFontSize` 記述を `titleStyle` に更新。
-
-### レンダリング（`TaskTable.svelte`）
-
-1. ボタン群（L197-215）と provider ループ（L222-）の **間** にグループメイン見出しを1回描画:
-
-```svelte
-{@const groupMetadata = providerGroups?.getMetadata()}
-
-{#if groupMetadata?.mainTitle}
-  <Heading tag="h2" class="text-2xl pb-3 text-gray-900 dark:text-white">
-    {groupMetadata.mainTitle}
-  </Heading>
-{/if}
-```
-
-2. provider ごとの見出し（L227-232）を `titleStyle` 参照に変更（フォールバックでデフォルト維持）:
-
-```svelte
-<Heading
-  tag={metadata.titleStyle?.headingTag ?? 'h2'}
-  class="{metadata.titleStyle?.fontSize ?? 'text-2xl'} {metadata.titleStyle?.bottomGap ??
-    'pb-3'} text-gray-900 dark:text-white"
->
-  {metadata.title}
-</Heading>
-```
-
-→ ICPC は メイン h2「ICPC 国内予選」、各年 h3「YYYY」(text-md, pb-2)。他グループは従来どおり h2 / text-2xl / pb-3。
-
-> **決定（user）**: メイン見出しと各年見出しで「ICPC 国内予選」が二重表示になるのを避けるため、各年見出しは年のみ（例「2025」）に短縮する。`getMetadata().title` を `String(year)` へ変更。`getContestRoundLabel` は `isShownRoundLabel: false` のため非表示で、変更不要。
-
-### プロバイダ（`aoj_icpc_providers.ts`）
-
-`getMetadata()` を変更:
-
-```typescript
-title: `${this.year}`, // 年のみ（メイン見出しとの二重表示を回避）
-titleStyle: { fontSize: 'text-md', bottomGap: 'pb-2', headingTag: 'h3' },
-```
-
-### グループ登録（`contest_table_provider_groups.ts`）
-
-`AojIcpcPrelim` グループの metadata に `mainTitle: 'ICPC 国内予選'` を追加。
-
-## 変更ファイル
-
-| ファイル                                                                  | 変更                                                                                                                                  |
-| ------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
-| `src/features/tasks/types/contest-table/contest_table_provider.ts`        | `ContestTableTitleStyle` 追加 / `ContestTableMetaData.titleFontSize` → `titleStyle` / `ContestTablesMetaData.mainTitle?` 追加 / TSDoc |
-| `src/features/tasks/utils/contest-table/aoj_icpc_providers.ts`            | `getMetadata()` を `titleStyle` に移行                                                                                                |
-| `src/features/tasks/utils/contest-table/contest_table_provider_groups.ts` | `AojIcpcPrelim` に `mainTitle` 追加                                                                                                   |
-| `src/features/tasks/components/contest-table/TaskTable.svelte`            | グループメイン見出し描画 + provider 見出しを `titleStyle` 参照に                                                                      |
-
-## テスト（TDD: 先にテスト更新 → red → 実装 → green）
-
-- **`aoj_icpc_providers.test.ts`**:
-  - `title` を assert している箇所（L230-232）を年のみ（`'2023'`）に更新。
-  - `titleFontSize` を assert している箇所（L238-240）を `titleStyle` に更新:
-    - `getMetadata().titleStyle.fontSize === 'text-md'`
-    - `getMetadata().titleStyle.bottomGap === 'pb-2'`
-    - `getMetadata().titleStyle.headingTag === 'h3'`
-- **`contest_table_provider_groups.test.ts`**: `AojIcpcPrelim` の `getMetadata()` toEqual に `mainTitle: 'ICPC 国内予選'` を追加（L294-297）。
-- 型変更はテストファースト対象外（testing.md の TDD 例外）。
-- `TaskTable.svelte` の変更はテンプレート表示のみ（`??` フォールバック）。Vitest は省略し E2E / 手動で確認（svelte-components.md / testing.md のコンポーネント方針に準拠）。
-
-## 検証
-
-1. `pnpm test:unit src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts src/features/tasks/utils/contest-table/contest_table_provider_groups.test.ts` → green
-2. `pnpm check`（型整合）/ `pnpm lint`
-3. `pnpm dev` で目視:
-   - ICPC 国内予選ボタン押下 → 先頭に h2「ICPC 国内予選」が1回表示
-   - 各年見出しが h3 / text-md / 隙間 pb-2（やや狭い）
-   - 他グループ（ABC, EDPC 等）はメイン見出しなし・従来の h2/text-2xl/pb-3 のまま（リグレッションなし）
diff --git a/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md b/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md
deleted file mode 100644
index 70ca259ff..000000000
--- a/docs/dev-notes/2026-06-10/aoj-icpc-prelim-table/plan.md
+++ /dev/null
@@ -1,248 +0,0 @@
-# ICPC 国内予選テーブル 実装計画 (Issue #3633)
-
-## 概要
-
-Issue #3633「ICPC・国内予選」のテーブルを追加する。`src/lib/utils/contest.ts` の `AOJ_ICPC`（`ICPC_TRANSLATIONS = { Prelim: ' 国内予選 ', ... }`）相当の分類・ラベルは**既に存在**しており、`classifyContest` / `contestTypePriorities`（priority 23）/ `getContestNameLabel` / AOJ URL 生成（`AojGenerator`）まで実装済み。一方で **テーブルプロバイダ（ContestTableProviderGroup）は未実装**で、AOJ 系（PCK/JAG/ICPC/COURSES/UNIVERSITY）の表示テーブルは1つも登録されていない。本タスクは ICPC 国内予選を「最初の AOJ テーブル」として、EDPC（PR #2286）相当の形式で追加する。
-
-スコープは **国内予選のみ**（`ICPCPrelim{year}`、1998〜2025 の28年分）。
-
-### 今回の3つの新規要件（既存実装に前例なし）
-
-1. **年度単位でテーブル分割（新しい年度が上）**: 年度クラスを28個作る代わりに、**1つのベースクラスをコンストラクタで年度指定して28回インスタンス化**する。既存の JOI/Tessoku は「セクションごとにサブクラス」だが、本件は「1クラス × year引数」とする。
-2. **表示ラベルのプレフィックス付与（DB値は不変）**: DB の `task_table_index`（= AOJ 問題ID、例 `1664`）を数値として昇順ソートし、最小を `A`, 次を `B`… に対応付け、表示タイトルを `(問題名)` → `A. (問題名)` に前置変換。ジャッジの欠落で連番にならない年度は **contest_id ごとの上書き Map** で個別対応（Map の中身は後でユーザーが提供）。
-   - **重要**: ICPC の DB タイトルは `"{name}"` のみ（`"{problem_index}. {name}"` ではない）。ICPC はアプリ側からの登録（初期仕様）で title にインデックスが付かなかったため。よって除去処理は不要で、letter を**前置するだけ**でよい（手入力の他 seed データは title にインデックス付きだが、ICPC は別扱い）。
-3. **テーブルタイトルのフォントサイズをこのテーブルだけ小さく**: 現状 `TaskTable.svelte` で `text-2xl` ハードコードのため、**プロバイダ単位で指定可能にする**（このテーブルは `text-xl`）。
-
-## 設計判断と既存資産の再利用
-
-- **ContestType レイヤはスキップ**: `AOJ_ICPC` は schema enum / `ContestType` 定数 / `classifyContest` / `contestTypePriorities` / `getContestNameLabel` / 分類・ラベルのテスト（`AOJ_ICPC_TEST_DATA`）まで完備。skill の Layer 1〜3 は不要。
-- **プロバイダ基盤の再利用**: `ContestTableProviderBase`（`src/features/tasks/utils/contest-table/contest_table_provider_base.ts`）を継承。`constructor(contestType, section?)` の `section` に年度文字列を渡すと provider key が `AOJ_ICPC::2025` となり一意化できる（`createProviderKey` 既存）。
-- **ラベル付与は generateTable をオーバーライドして表示用 title を差し替える方式**（共有コンポーネント無改造）。ICPC の title は `"{name}"` のみなので除去は不要、`{letter}. ` を**前置するだけ**。`isShownTaskIndex: true` でセルは `taskResult.title` をそのまま表示。
-- **letter 割当はピュアな util に切り出してテスト**（coding-style: business logic → utils + adjacent test）。
-- **seed 行の形式**は既存 AOJ/JAG 行に準拠: `{ id, contest_id, problem_index, name, title }`、`grade` 省略 = PENDING。ただし **ICPC は `title = "{name}"`**（problem_index プレフィックスなし。アプリ登録の初期仕様に合わせる）。`problem_index` には AOJ id を入れる。
-
-### 却下した代替案
-
-- **年度ごとにサブクラス（JOI/Tessoku 流）**: 28クラスは冗長。ユーザー要件「ベースクラス1つ + コンストラクタで年度指定」に反する。→ 却下。
-- **セル表示ロジックを `TaskTableBodyCell.svelte` 側に分岐追加**: 共有コンポーネントに ICPC 専用分岐が漏れる。generateTable で表示用 title を生成する方がプロバイダ内に閉じる。→ 却下。
-- **`title` フォントサイズを全テーブル一律変更**: 他テーブルへ影響。→ 却下、プロバイダ単位の任意設定にする。
-- **letter を AOJ API の配列順から決定**: 欠落年度では配列順≠正規レター。`task_table_index` 数値昇順 + 上書き Map の方が DB 単独で完結。→ 数値昇順を採用（ユーザー選択）。
-
----
-
-## Phase 0: Seed データ収集（ブロッカー・最初に実施）
-
-`prisma/tasks.ts` に ICPC 行が0件。AOJ Judge API から収集して追加する。
-
-- データ源: `https://judgeapi.u-aizu.ac.jp/challenges/cl/icpc/prelim`
-  - `contests[].abbr`（例 `ICPCPrelim2025`）、`contests[].days[].problems[]` に `id`（数値文字列）・`name`。
-- 各 problem を1行に変換（`prisma/tasks.ts` の配列へ追記）:
-  ```js
-  {
-    id: '1664',
-    contest_id: 'ICPCPrelim2023',
-    problem_index: '1664',  // = AOJ id（DB の task_table_index にマップ）
-    name: '<API の name>',
-    title: '<API の name>', // ICPC は name のみ（index プレフィックスを付けない）
-    // grade 省略 → PENDING
-  }
-  ```
-- 28年分（1998〜2025、各4〜9問、計 ~170行）。
-- 検証: `classifyContest('ICPCPrelim2023') === ContestType.AOJ_ICPC`、`getContestNameLabel` が `（ICPC 国内予選 2023）` 系を返すこと（既存テストの延長で確認可）。
-
-> 注: gap（ジャッジ欠落で A,B,C… が連続しない年度）の特定は Phase 2 の上書き Map 用データとして別途ユーザーが提供。Phase 0 では API が返す問題のみ seed する。
-
-**critical file**: `prisma/tasks.ts`
-
----
-
-## Phase 1: タイトルフォントサイズのプロバイダ単位設定（低リスク・独立）
-
-- `ContestTableMetaData`（`src/features/tasks/types/contest-table/contest_table_provider.ts`）に任意フィールド追加:
-  ```ts
-  titleFontSize?: string; // Tailwind class, e.g. 'text-xl'. Defaults to 'text-2xl' at render.
-  ```
-- `TaskTable.svelte` のタイトル描画を変更（L227 付近）:
-  ```svelte
-  <Heading tag="h2" class="{metadata.titleFontSize ?? 'text-2xl'} pb-3 text-gray-900 dark:text-white">
-  ```
-- 既存プロバイダは未指定 → デフォルト `text-2xl` 維持（後方互換）。
-
-**critical files**: `contest_table_provider.ts`, `TaskTable.svelte`
-
----
-
-## Phase 2: letter 割当ユーティリティ（TDD）
-
-新規 util（feature-scoped）: `src/features/tasks/utils/contest-table/aoj_icpc_labels.ts`
-
-- 上書き Map 定数（初期は空 or 既知の gap 年度のみ。中身は後日ユーザー提供）:
-  ```ts
-  // contest_id -> (task_table_index -> letter). Used only for years with judge gaps.
-  export const ICPC_PRELIM_LABEL_OVERRIDES: Record<string, Record<string, string>> = {
-    // e.g. ICPCPrelim2007: { '1150': 'A', '1152': 'C', ... }
-  };
-  ```
-- 関数:
-  ```ts
-  // Build task_table_index -> letter map for one contest.
-  // Default: sort indices numerically asc, assign A, B, C...
-  // Override: if ICPC_PRELIM_LABEL_OVERRIDES[contestId] exists, use it.
-  export function buildAojIcpcLetterMap(
-    contestId: string,
-    taskTableIndices: string[],
-  ): Map<string, string>;
-  ```
-- 隣接テスト `aoj_icpc_labels.test.ts`:
-  - 自動連番: `['1665','1664']` → `{1664:'A', 1665:'B'}`（数値昇順）。
-  - 上書き Map 経路: フィクスチャ contest_id で Map が優先されること。
-  - ICPC 国内予選は最大9問（A〜I）で収まる前提を明記。
-
-**critical file**: `aoj_icpc_labels.ts`（+ test）
-
----
-
-## Phase 3: AojIcpcPrelimProvider（TDD・1クラス×year引数）
-
-新規 `src/features/tasks/utils/contest-table/aoj_icpc_providers.ts`
-
-```ts
-export class AojIcpcPrelimProvider extends ContestTableProviderBase {
-  private readonly year: number;
-  private readonly contestId: string;
-
-  constructor(contestType: ContestType, year: number) {
-    super(contestType, String(year)); // provider key: AOJ_ICPC::{year}
-    this.year = year;
-    this.contestId = `ICPCPrelim${year}`;
-  }
-
-  protected setFilterCondition() {
-    return (taskResult: TaskResult) => taskResult.contest_id === this.contestId;
-  }
-
-  // Override: prepend assigned letter to the title (display only; DB unchanged).
-  // ICPC titles are stored as "{name}" only, so no prefix removal is needed.
-  generateTable(filtered: TaskResults): ContestTable {
-    const letterMap = buildAojIcpcLetterMap(
-      this.contestId,
-      filtered.map((taskResult) => taskResult.task_table_index),
-    );
-    const table: ContestTable = { [this.contestId]: {} };
-
-    for (const taskResult of filtered) {
-      const index = taskResult.task_table_index;
-      const letter = letterMap.get(index) ?? index;
-      table[this.contestId][index] = { ...taskResult, title: `${letter}. ${taskResult.title}` };
-    }
-
-    return table;
-  }
-
-  // Ensure left-to-right cell order is numeric (A,B,C...). Safeguard for variable-width ids.
-  getHeaderIdsForTask(filtered: TaskResults): string[] {
-    return Array.from(new Set(filtered.map((taskResult) => taskResult.task_table_index))).sort(
-      (first, second) => Number(first) - Number(second),
-    );
-  }
-
-  getMetadata(): ContestTableMetaData {
-    return {
-      title: `ICPC 国内予選 ${this.year}`,
-      abbreviationName: `icpcPrelim${this.year}`,
-      titleFontSize: 'text-xl',
-    };
-  }
-
-  getDisplayConfig(): ContestTableDisplayConfig {
-    return {
-      isShownHeader: false,
-      isShownRoundLabel: false,
-      roundLabelWidth: '',
-      tableBodyCellsWidth: 'w-1/2 xs:w-1/3 sm:w-1/4 md:w-1/5 lg:w-1/6 2xl:w-1/7 px-1 py-2', // EDPC 相当
-      isShownTaskIndex: true, // show transformed "{letter}. {name}" as-is
-    };
-  }
-
-  getContestRoundLabel(): string {
-    return `ICPC 国内予選 ${this.year}`; // unused (isShownRoundLabel: false) but required
-  }
-}
-```
-
-- 隣接テスト `aoj_icpc_providers.test.ts`（Pattern 2 系・年度フィクスチャで検証）:
-  - `filter`: `ICPCPrelim2023` の行のみ抽出。
-  - `generateTable`: title が `A. ...` / `B. ...` に置換（DB の `task_table_index`/`task_id` は不変）。
-  - `getMetadata`: `title === 'ICPC 国内予選 2023'`、`titleFontSize === 'text-xl'`。
-  - `getDisplayConfig`: `isShownHeader === false` 等。
-  - 上書き Map フィクスチャ年度で letter が Map 通りになること。
-
-**critical files**: `aoj_icpc_providers.ts`（+ test）
-
----
-
-## Phase 4: グループ登録（TDD・新規グループ）
-
-`src/features/tasks/utils/contest-table/contest_table_provider_groups.ts`
-
-```ts
-// Range of ICPC domestic-prelim years available on AOJ.
-// OLDEST is a stable domain constant (first season on AOJ).
-// LATEST must be bumped when a new season is seeded into prisma/tasks.ts.
-const ICPC_PRELIM_OLDEST_YEAR = 1998;
-const ICPC_PRELIM_LATEST_YEAR = 2025;
-
-AojIcpcPrelim: () => {
-  const group = new ContestTableProviderGroup('ICPC 国内予選', {
-    buttonLabel: 'ICPC 国内予選',
-    ariaLabel: 'Filter ICPC Domestic Preliminary',
-  });
-  // Iterate from latest to oldest so the newest year's table renders on top.
-  for (let year = ICPC_PRELIM_LATEST_YEAR; year >= ICPC_PRELIM_OLDEST_YEAR; year--) {
-    group.addProvider(new AojIcpcPrelimProvider(ContestType.AOJ_ICPC, year));
-  }
-  return group;
-},
-```
-
-- `contestTableProviderGroups` に `aojIcpcPrelim: presets.AojIcpcPrelim()` を追加（JOI 群の後ろ＝外部プラットフォーム位置）。
-- 定数 `ICPC_PRELIM_OLDEST_YEAR` / `ICPC_PRELIM_LATEST_YEAR` はモジュール冒頭に配置（`prepareContestProviderPresets` の外）。
-- `contest_table_provider_groups.test.ts` 更新:
-  - 新グループ名 / buttonLabel / ariaLabel。
-  - `getSize() === ICPC_PRELIM_LATEST_YEAR - ICPC_PRELIM_OLDEST_YEAR + 1`（= 28）。
-  - `getProvider(ContestType.AOJ_ICPC, '2023')` が `AojIcpcPrelimProvider` を返す。
-  - import 追加。
-- （任意）drift 検知: seed 中の最新 `ICPCPrelim` 年度が `ICPC_PRELIM_LATEST_YEAR` と一致することを検証するテストを追加すると、seed 追加時の定数未更新を防げる。
-
-**critical files**: `contest_table_provider_groups.ts`（+ group test）
-
----
-
-## Phase 5: 最終検証
-
-- `pnpm test:unit`（特に `src/features/tasks/utils/contest-table/`）
-- `pnpm check`
-- `pnpm lint` / `pnpm format`
-- 手動/E2E 確認:
-  - `pnpm dev` → タスク一覧でボタン「ICPC 国内予選」を選択。
-  - 年度テーブルが **2025 → 1998 の順**で縦に並ぶ。
-  - 各セルが `A. (問題名)`、`B. (問題名)`… で表示され、タイトル見出しが他テーブルより小さい（`text-xl`）。
-  - 外部リンクが AOJ（`judge.u-aizu.ac.jp/.../id={task_id}`）へ遷移。
-
----
-
-## 実装メモ
-
-- コミット粒度: Phase 0（seed）／ Phase 1（font config）／ Phase 2-3（util + provider）／ Phase 4（group）で分割。
-- gap 年度の上書き Map データはユーザー提供待ち。提供後に `ICPC_PRELIM_LABEL_OVERRIDES` を埋め、該当年度のテストを追加。
-- 26問超は ICPC 国内予選では発生しない（最大9問）ため A〜Z 超のロジックは実装しない（YAGNI）。
-
-## チェックリスト
-
-- [ ] Phase 0: AOJ API から seed 収集し `prisma/tasks.ts` に追加（1998〜2025）
-- [ ] Phase 1: `titleFontSize` 追加 + `TaskTable.svelte` 反映
-- [ ] Phase 2: `aoj_icpc_labels.ts`（letter util + 上書き Map）+ test
-- [ ] Phase 3: `aoj_icpc_providers.ts`（AojIcpcPrelimProvider）+ test
-- [ ] Phase 4: グループ登録 + groups test 更新
-- [ ] Phase 5: `pnpm test:unit` / `check` / `lint` / 手動確認
-- [ ] gap 年度 上書き Map（ユーザー提供後）

From 31141d825c73380bdcff03956c9522ec01d77f48 Mon Sep 17 00:00:00 2001
From: "k.hiro1818" <k.hiro1818@gmail.com>
Date: Wed, 10 Jun 2026 12:59:22 +0000
Subject: [PATCH 7/7] fix(contest): replace text-md with text-base (Tailwind v4
 class)

text-md is not a valid Tailwind v4 utility; text-base is the correct
font-size class. Also simplifies the skill instructions for pattern 2/3.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .claude/skills/add-contest-table-provider/instructions.md   | 6 +++---
 .../tasks/types/contest-table/contest_table_provider.ts     | 2 +-
 .../tasks/utils/contest-table/aoj_icpc_providers.test.ts    | 4 ++--
 .../tasks/utils/contest-table/aoj_icpc_providers.ts         | 2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/.claude/skills/add-contest-table-provider/instructions.md b/.claude/skills/add-contest-table-provider/instructions.md
index e5608c686..2c987bf52 100644
--- a/.claude/skills/add-contest-table-provider/instructions.md
+++ b/.claude/skills/add-contest-table-provider/instructions.md
@@ -29,9 +29,9 @@ Step 0 (seed check) is already done. Confirm the following before touching code:
 - Constructor parameter name and type (e.g. `year: number`)?
 - Year/ID range: oldest and latest? Export both as named constants so tests can reference them.
 - Iteration order: latest-first so newest table renders on top.
-- `task_table_index` values numeric strings? → override `getHeaderIdsForTask` with `Number(a) - Number(b)` sort.
-- `generateTable` needs display-only title transform (e.g. prepend letter)? → override it AND override `getHeaderIdsForTask` using the same key derivation — mismatched keys between the two methods cause missing cells.
-- Edge cases where the default algorithm breaks? → add a `Record<string, Record<string, string>>` override map; populate it per contest_id; test the override path with `beforeEach`/`afterEach` mutation.
+- `task_table_index` values numeric strings? → override `getHeaderIdsForTask`; sort with `Number(a) - Number(b)`.
+- Display-only title transform needed (e.g. prepend letter)? → override `generateTable` for the transform AND override `getHeaderIdsForTask` using the same key derivation; mismatched keys between the two methods cause missing cells.
+- Known edge cases where the default algorithm breaks? → add a `Record<string, Record<string, string>>` module-level override map keyed by contest_id; exercise the override path in tests by mutating the export in `beforeEach` and cleaning up in `afterEach`.
 
 **Pattern 3 additional:**
 
diff --git a/src/features/tasks/types/contest-table/contest_table_provider.ts b/src/features/tasks/types/contest-table/contest_table_provider.ts
index 1214a0188..e112588f6 100644
--- a/src/features/tasks/types/contest-table/contest_table_provider.ts
+++ b/src/features/tasks/types/contest-table/contest_table_provider.ts
@@ -142,7 +142,7 @@ export type ContestTableMetaData = {
  *
  * @typedef {Object} ContestTableTitleStyle
  * @property {'h2' | 'h3'} [headingTag] - Heading element tag. Defaults to 'h2' at render.
- * @property {string} [fontSize] - Tailwind font-size class, e.g. 'text-md'. Defaults to 'text-2xl' at render.
+ * @property {string} [fontSize] - Tailwind font-size class, e.g. 'text-base'. Defaults to 'text-2xl' at render.
  * @property {string} [fontWeight] - Tailwind font-weight class, e.g. 'font-normal'. Defaults to Flowbite Heading default (bold).
  * @property {string} [bottomGap] - Tailwind padding-bottom class, e.g. 'pb-1'. Defaults to 'pb-3' at render.
  */
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts b/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
index 5b3c93cc5..b877d1860 100644
--- a/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_providers.test.ts
@@ -235,10 +235,10 @@ describe('AojIcpcPrelimProvider', () => {
       expect(provider2023.getMetadata().abbreviationName).toBe('icpcPrelim2023');
     });
 
-    test('returns titleStyle with text-md font size, pb-2 bottom gap, and h3 heading tag', () => {
+    test('returns titleStyle with text-base font size, pb-1 bottom gap, and h3 heading tag', () => {
       expect(provider2023.getMetadata().titleStyle).toEqual({
         headingTag: 'h3',
-        fontSize: 'text-md',
+        fontSize: 'text-base',
         fontWeight: 'font-normal',
         bottomGap: 'pb-1',
       });
diff --git a/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts b/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
index 182c90ddf..b90a42f51 100644
--- a/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
+++ b/src/features/tasks/utils/contest-table/aoj_icpc_providers.ts
@@ -54,7 +54,7 @@ export class AojIcpcPrelimProvider extends ContestTableProviderBase {
       abbreviationName: `icpcPrelim${this.year}`,
       titleStyle: {
         headingTag: 'h3',
-        fontSize: 'text-md',
+        fontSize: 'text-base',
         fontWeight: 'font-normal',
         bottomGap: 'pb-1',
       },