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好坑！用froyd的话不能算出所有值之后再处理！在这里卡住了= =另外还要注意，环的长度k>2！！！在这里无限WA！我以为如果A-B有重边那么A-B-A也是可行的为此录入数据时还特别判断了一下。。。简直多此一举，删了就AC了！ Followed by:
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