Create 0022-generate-parentheses.md #54
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potrue
reviewed
Nov 4, 2025
| if close_remain > open_remain: | ||
| stack.append((path + [")"], open_remain, close_remain - 1)) | ||
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| return results |
potrue
reviewed
Nov 4, 2025
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| ### 実装5 | ||
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| - Backtrackingをloopで実装。 |
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僕の認識が間違っていたら申し訳ないんですが、新しくpathを二つ生成して次に残しておくような感じになっていて、「後戻り」をしている感じではないので、厳密に言えばいわゆるバックトラックとは少し違うかもしれないと思いました。
potrue
reviewed
Nov 4, 2025
| path.pop() | ||
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| dfs(0, 0) | ||
| return results |
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下のコードとは逆に、これはdfsというよりはbacktrackにあたるのではないかと思います。
ロジックは読みやすいと思います。open_used, close_usedは個数ということを分かりやすくするためにnum_open, num_closeなどでもいいかもしれないと思いました。
nodchip
reviewed
Nov 4, 2025
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| ### 実装1 | ||
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| - 貪欲法（枝刈りつきBFS） |
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BFS を貪欲法と呼ぶのは違和感を感じました。貪欲法は、その場その場で良さそうな選択肢を取り、最終的に最適解を得る手法だと思います。
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この問題：https://leetcode.com/problems/generate-parentheses/
次の問題：https://leetcode.com/problems/move-zeroes/