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AC了，来说说我对题意的理解这道题就是说每种代表车型的串，他们的distance就是串中不同字符的个数，要求算出所有串的distance's 最小 sum ； 看题看了老半天，其实就是个最小生成树，一次AC，虽然mem 和 time 都大的不行，但lenght还是排在第一 hehe Followed by:
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