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不知各位有没有考虑这个情况

Posted by raoxiaojia at 2009-10-21 19:13:02 on Problem 1820 and last updated at 2009-10-21 19:13:52

        1            2
       / \          / \
      2   3        4   1
     /   /              \
    4   5                3
                          \
                           5
     Tree 1         Tree 2

Tree 1 和 Tree 2 一眼看上去好像完全不一样，但如果将 Tree 2 以1号节点为根建树，就会
发现其实这两棵树是完全一致的！不知道这种情况算不算？题目里好像没有讲。难道传说中的
2000多提交，0接受就是这么出来的？

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