276. Paint Fence #31
Open
276. Paint Fence #31
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
hayashi-ay
reviewed
Sep 30, 2024
| - 行列累乗はnumpyで | ||
| - matrix_power | ||
| - https://numpy.org/doc/2.0/reference/generated/numpy.linalg.matrix_power.html | ||
| - 計算量的には O(n) -> O(log n) と落ちるはずだがleetcode上ではむしろ遅くなった |
There was a problem hiding this comment.
計算量は定数倍を無視した極限での振る舞いを表すものなので、計算量的に良くても実際の処理速度が早いかどうかはまた別の話ですね。今回みたいにn<=50と小さい場合だとnumpyのライブラリ側の処理のオーバーヘッドの方が大きいみたいですね。
| ```python | ||
| class Solution: | ||
| def numWays(self, n: int, k: int) -> int: | ||
| same = 0 |
There was a problem hiding this comment.
個人的には、same_with_previous、different_from_previousくらい書いても良いかなという気もします。
nodchip
reviewed
Oct 1, 2024
| # initial conditions | ||
| # num_ways_diff[1] = k, num_ways_same[1] = 0 | ||
|
|
||
| num_ways_same[1] = 0 |
There was a problem hiding this comment.
インデックスを 1 から始めたのは何か意味があるのでしょうか？通常は 0 から始めることが多いと思います。
Owner
Author
There was a problem hiding this comment.
初期条件を何もない状態へ設定可能な問題と統一的な考え方が出来るように、部分問題を 1-indexed で考えるようにしてみています。ですが、この辺りまだ模索中です。
sakupan102
reviewed
Oct 3, 2024
| - 変数名は迷ったが、`num_ways_same` と `num_ways_diff` としてみた。`same` と `diff` だけでもいいかもしれない | ||
| ```python | ||
| class Solution: | ||
| def numWays(self, n: int, k: int) -> int: |
There was a problem hiding this comment.
引数名をnum_postsとnum_colorsとかにしても良いかと思いました。
|
遅くなりすみません。拝見しました！ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
問題へのリンク
leetcode: https://leetcode.com/problems/paint-fence/description/
lintcode: https://www.lintcode.com/problem/514/
Question:
You are painting a fence of n posts with k different colors. You must paint the posts following these rules:
Given the two integers n and k, return the number of ways you can paint the fence.
次に解く問題
300. Longest Increasing Subsequence
README.mdへ頭の中の言語化と記録をしています。