回答編集履歴
1
不要なiterの削除
test
CHANGED
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@@ -20,7 +20,7 @@
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20
20
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reverse_or_not.reverse()
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-
flip =
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23
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+
flip = cycle(reverse_or_not).__next__
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yield from (i for r in range(1, n + 1) for i in flip()(range(r)))
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