Solved Arai60/78. Subsets #50
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oda
reviewed
Dec 19, 2025
| ## Step 3. Final Solution | ||
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| - 再帰での実装を練習 | ||
| - List_A += List_Bを関数内関数で行うとエラー |
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nonlocal List_A がいります。
+= は iadd が定義されていれば iadd なければ add を使って足し算と代入をするという仕組みなので参照先を変更する可能性があるので必要です。
近い話としては、このあたり。
https://docs.google.com/document/d/11HV35ADPo9QxJOpJQ24FcZvtvioli770WWdZZDaLOfg/edit?tab=t.0#heading=h.jwt99kks0w2
nodchip
reviewed
Dec 21, 2025
| for subset in all_subsets]) | ||
| if index_to_add + 1 < len(nums): | ||
| add_subsets(index_to_add + 1) | ||
| all_subsets = [[]] |
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inner function 内で使用されている変数が、 inner function より後に定義されていると、変数の定義を探すために上下に目線が移動します。これは読み手にとってやや煩わしく感じます。 inner function の中で使用する変数は、 inner function より前に定義することをお勧めします。
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問題文：https://leetcode.com/problems/subsets/description/