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给组数据，就知道为什么了

Posted by XKing at 2015-05-06 10:36:47 on Problem 2762
In Reply To:这道题大家写麻烦了！ tarjan+缩点就做完了啊~拓扑排序干嘛 0_0【329ms】 Posted by:ssdut_201392326 at 2014-08-12 16:13:54 
5
3 3
1 2
2 3
3 1

5 5
1 2
2 3
3 1
3 4
4 5

4 4
1 2
2 3
3 1
4 3

4 4
1 2
1 3
2 4
3 4
答案是
yes yes yes yes no
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