回答編集履歴
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wandbox
test
CHANGED
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@@ -1 +1,5 @@
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1
1
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条件文で`fin >> str`すればいいのでは
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+
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+
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+
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5
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[https://wandbox.org/permlink/1w2qk3RlfDm1Dvw1](https://wandbox.org/permlink/1w2qk3RlfDm1Dvw1)
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