feat: add refresh button to ProblemSwitcher

Update.json

@@ -3433,6 +3433,17 @@
                 }
             ],
             "Notes": "No release notes were provided for this release."
+        },
+        "3.3.2": {
+            "UpdateDate": 1773497456666,
+            "Prerelease": true,
+            "UpdateContents": [
+                {
+                    "PR": 934,
+                    "Description": "feat: add refresh button to ProblemSwitcher"
+                }
+            ],
+            "Notes": "Added a refresh button (↻) to the ProblemSwitcher panel. Clicking it invalidates the cached contest problem list and reloads the page, useful when contest problems are updated mid-contest."
         }
     }
 }

XMOJ.user.js

@@ -1,6 +1,6 @@
 // ==UserScript==
 // @name         XMOJ
-// @version      3.3.1
+// @version      3.3.2
 // @description  XMOJ增强脚本
 // @author       @XMOJ-Script-dev, @langningchen and the community
 // @namespace    https://github/langningchen
@@ -2323,6 +2323,30 @@ async function main() {
                             }
                             problemSwitcher.innerHTML += `<a href="${problemList[i].url}" title="${problemList[i].title.trim()}" class="btn btn-outline-secondary mb-2 ${activeClass}">${buttonText}</a>`;
                         }
+                        let refreshCid = SearchParams.get("cid");
+                        let refreshBtn = document.createElement("a");
+                        refreshBtn.title = "刷新缓存";
+                        refreshBtn.classList.add("btn", "btn-outline-secondary", "mt-2");
+                        refreshBtn.innerHTML = "↻";
+                        refreshBtn.href = "#";
+                        if (refreshCid) {
+                            refreshBtn.addEventListener("click", function(e) {
+                                e.preventDefault();
+                                let prefix = "UserScript-Contest-" + refreshCid + "-";
+                                let keysToRemove = [];
+                                for (let k = 0; k < localStorage.length; k++) {
+                                    let key = localStorage.key(k);
+                                    if (key && key.startsWith(prefix)) {
+                                        keysToRemove.push(key);
+                                    }
+                                }
+                                keysToRemove.forEach(k => localStorage.removeItem(k));
+                                location.reload();
+                            });
+                        } else {
+                            refreshBtn.style.display = "none";
+                        }
+                        problemSwitcher.appendChild(refreshBtn);
                         document.body.appendChild(problemSwitcher);
                     }
                     if (document.querySelector("body > div > div.mt-3 > h2") != null) {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "xmoj-script",
-  "version": "3.3.1",
+  "version": "3.3.2",
   "description": "an improvement script for xmoj.tech",
   "main": "AddonScript.js",
   "scripts": {