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TLE 5次 终于发现了真相 请叫我真相帝

Posted by xuchang at 2011-04-12 10:20:18 on Problem 1724 
1.数据显然是有环的 而且N多环
2.建立邻接表的时候，如果是每次将新结点插入链表尾部，则超时 如果是插入链表头部 则秒杀
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