随笔分类 - OJ-codeforces
摘要：题目链接 题目 This is simplified version of the problem used on the original contest. The original problem seems to have too difiicult solution. The constra
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摘要：题目链接 题目 Everyone knows that long ago on the territory of present-day Berland there lived Bindian tribes. Their capital was surrounded by n n n hills,
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摘要：题目链接 题目 This is yet another problem dealing with regular bracket sequences. We should remind you that a bracket sequence is called regular, if by inse
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摘要：题目链接 题目 Peter decided to wish happy birthday to his friend from Australia and send him a card. To make his present more mysterious, he decided to make
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摘要：题目链接 题目 This is yet another problem on regular bracket sequences. A bracket sequence is called regular, if by inserting "+" and "1" into it we get a c
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摘要：题目链接 题目 A group of tourists is going to kayak and catamaran tour. A rented lorry has arrived to the boat depot to take kayaks and catamarans to the po
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摘要：题目链接 题目 There is a square matrix n × n, consisting of non-negative integer numbers. You should find such a way on it that starts in the upper left cel
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摘要：题目链接 题目 The winner of the card game popular in Berland "Berlogging" is determined according to the following rules. If at the end of the game there is
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摘要：题目链接 题目 You are given a sequence of numbers a1, a2, ..., an, and a number m. Check if it is possible to choose a non-empty subsequence aij such that t
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摘要：题目链接 我要是在noip前做这道题就好了。 这道题的本质就是noip2021方差中的一个性质，对于每个数进行修改，就是把它左右的差进行交换。 注意的是首项一定要一样。 Code // Problem: CF1110E Magic Stones // Contest: Luogu // URL: h
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摘要：题目链接 由于 ，所以我们可以直接枚举每条题目选或不选，最后判断是否合法即可。 时间复杂度：。 Code // Problem: CF550B Preparing Olympiad // Contest: Luogu // URL: https:
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