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题目到底是什么意思？

Posted by Windwing at 2007-07-22 11:04:48 on Problem 3272 
这道题到底是求从入度为零的点到指定终点的可能路径总数呢（例子中有四条路径可以到底点7），
还是要求从某一入度为零的点到指定终点的最长路径长度（例子中四条路径均经过4条边），
还是求从一个入读为零的点到指定终点所有可能路径中所有边被覆盖次数的最大值（例子中6-7这条边被覆盖4次）？

读不懂题，那个ｐａｔｈ不确定是什么意思～……
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