> v中，其所经过的每一段线路的相同的字母。经典的传递闭包问题。-There are n cities between a given directed graph, each edge is marked letters in each line feasible u-> v, and they go through the same section of the line output of each letter. Classic transitive closure problem.

chuandibibao\chuandibibaowenti.txt
chuandibibao
pudn.txt

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