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管理员应该check一下本题的数据。

Posted by Standard at 2006-04-01 20:52:12 on Problem 1703
猜测:本题的数据应该有问题。
      对某些数据根据以前的条件已经可以推出i,j属于相同的集合,但是依然给出D i j。
这样会导致一些程序的死循环和RTE。

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