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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 on Problem 3740 
Given a M×N matrix A. Aij ∈ {0, 1} (0 ≤ i < M, 0 ≤ j < N), could you find some rows that let every cloumn contains and only contains one 1. 
我是这样理解的：
4 4
0 1 0 0
1 0 1 0
0 0 0 0
1 0 1 0

输出：
Yes, I found it
因为我找到第一行的第二列只有一个1，并且此列也只有一个1
0 1 0 0
  0
  0
  0
所以Yes, I found it
对吗？
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