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求AC这道题的24K 0MS 代码参考一下

Posted by Firefrog at 2011-06-20 11:44:47 on Problem 1562 and last updated at 2011-06-20 15:02:41 
我用DFS方法AC了这一题，但是花费时间是 16MS。看到有人用 0MS AC 了，求代码参考一下。
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