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请教该算法的正确性（我好像可以证明，但一直WA），感激不尽

Posted by ghost_wei at 2006-08-17 19:14:47 on Problem 2942 
先找出连通块，对每一个连通块，如果该连通块含奇回路，那么该连通块的所有点都可行。
这样找奇回路：从任一点开始进行标号，如果某节点被标为1，则与之相邻的将被标为2。反之亦然。如果有点既被标为1，又被标为2，那么，该连通块含奇回路。
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