Create 0078-subsets.md - #52
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shintaro1993
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Nov 3, 2025
| if use_flag & bit: | ||
| subset.append(nums[index]) | ||
| index += 1 | ||
| bit <<= 1 |
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for のループインデックスを使うのもよさそうかなと思いましたが、このように bit <<=1 していった方が全体としてビット操作をしている感じがしていいなと思いました。
tokuhirat
reviewed
Nov 3, 2025
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| ## Step 3 | ||
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| [実装2](#実装2)、[実装4](#実装4)あたりを確認した。 |
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問題ないと思います。他の人が書いたコードを読んでみるのもやってみると良いと思います。
oda
reviewed
Nov 17, 2025
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| #### 実装5-3 | ||
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| - 修正案その2：map のデフォルト引数で束縛 |
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map というか lambda ですね。
Python は、スコープを作るのが関数くらいです。
私はこのあたりでデフォルト引数で固定するイディオムを知りました。
https://discord.com/channels/1084280443945353267/1339428945845555252/1381993770840756226
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この問題：https://leetcode.com/problems/subsets/
次の問題：https://leetcode.com/problems/combination-sum/