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COWregion的标号居然有负的，RE了n次，改成用map对应……还好用的是小号 只要全部点中，每一个点只要可以由其他某一个点走偶数步达到就可以了。 1--2--3--4 我的意思：1到达3要偶数步 Followed by: Post your reply here: |
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