摘要：
题目链接 Problem Description As to a permutation p1,p2,⋯,pn from 1 to n, it is uncomplicated for each 1≤i≤n to calculate (li,ri) meeting the condition tha 阅读全文
posted @ 2017-07-30 11:16
茶飘香~
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摘要：
题目链接 Problem Description There is a tree with n nodes, each of which has a type of color represented by an integer, where the color of node i is ci.Th 阅读全文
posted @ 2017-07-30 10:36
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