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Re:3740老是wa?是不是我理解题意有问题啊?请大牛进来指点下!

Posted by xingchen12 at 2009-08-23 14:40:11 on Problem 3740
In Reply To:3740老是wa?是不是我理解题意有问题啊?请大牛进来指点下! Posted by:wskiwwwx at 2009-08-23 14:27:16
我的理解。。。
能找出一些行 使得这些行组成的matrix的每一列都有一个1 而且只能有一个1
4 4
0 1 0 0
1 0 1 0
0 0 0 0
1 0 1 0
这个第4列 全是0。。。应该是impossible吧。。。

不过我也没过 一直WA。。。

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