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题目描述 In the country there are n n n cities and m m m bidirectional roads between them. Each city has an army. Army of the i i i -th city consists of a 阅读全文
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题目描述 You are given a string s s s consisting of n n n lowercase Latin letters. Let's denote k k k -substring of s s s as a string subsk=sksk+1..sn+1−k 阅读全文
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题目描述 You are given a string s s s of length n n n consisting of lowercase English letters. For two given strings s s s and t t t , say S S S is the se 阅读全文
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题目描述 小A现在有 NN 道题，编号为 1,2,\cdots,N1,2,⋯,N 。每道题的起始毒瘤程度为 00 或 11 。在每回合，小A可以将编号连续的 KK 道题的毒瘤程度+1。但小B因为本身比较菜，不是很愿意小A出毒瘤题，所以在 w_iwi 回合开始时可以向第 x_ixi 题传播 v_i 阅读全文