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一次AC，可以用O(N)的算法，我偷懒写了O(N*N)的。

Posted by yygy at 2013-01-26 16:45:18 on Problem 1192
In Reply To:原来不难~没看到这句话，想了很久~ Posted by:choupigwb at 2008-11-17 20:41:43 
> 定义4 若整点集V满足：对于V中
> 的任何两个整点，
> V中有且仅有一条连接这两点的道路，                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 则V称为单整点集。
> 说明是颗树。
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