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确实是爆搜。还0ms。太无语了

Posted by KatrineYang at 2017-02-23 00:41:47 on Problem 1392 and last updated at 2017-02-23 00:43:06 
RT
另外注意，dfs不要弄一大堆局部变量，会爆栈的。苯地一般是RE（我的機子到n=14就RE），交上去估计MLE，没试过
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