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Description You have a rooted tree consisting of n vertices. Each vertex of the tree has some color. We will assume that the tree vertices are numbere 阅读全文
posted @ 2016-07-18 16:45
ljh_2000
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摘要：
Description An array of positive integers a1, a2, ..., an is given. Let us consider its arbitrary subarray al, al + 1..., ar, where 1 ≤ l ≤ r ≤ n. For 阅读全文
posted @ 2016-07-18 15:10
ljh_2000
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