当我们倒着做,会发现修改操作先于查询操作,而查询操作要求区间内字符一样,也就意味着修改操作其实是固定了,即我们只能利用修改操作将此区间变为一致,而不能用于其他。 考虑怎么修改:线段树。利用线段树维护区间01 0101的个数。 1. 1.1.当区间1 11的数量多于0 00的数量时,我们就要把区间变为全1 11 2. 2.2.当...
1975D — Paint the Tree Just solve the problem manually and claim it is the best solution.Surelyit is. Spoiler 1967C — Fenwick Tree Have you ever played the game 'find next number in the sequence?' Spoiler 1965C — Folding Strip - Just fold whenever you can! - Wait. What if I get...
随笔分类 - codeforces Educational Codeforces Round 25 摘要:这一场是暑期的第一场,做了4个题,被HACK两个,都是很粗心的错误,手生的问题。 【A】Binary Protocol 题意:给你一串字符串,只有0和1。用m个0将字符串分为m+1段,每段字符串中‘1’的个数代表一个数。 做法:在末尾补0.然后扫一遍。遇到1累加...
CodeforcesEDU .gitignore 1000A-CodehorsesTshirts.cpp 1000B-LightItUp.cpp 1000C-CoveredPointsCount.cpp 1003A-PolycarpsPockets.cpp 1003B-BinaryStringConstructing.cpp 1003C-IntenseHeat.cpp 1003D-CoinsAndQueries.cpp 1004A-SonyaAndHotels.cpp 1004B-SonyaAndExhibition.cpp 1004C-SonyaAndRobots.cpp 1005A-...
*String is one kind of char Array. So, its deserves a address hold. So that, we write: (“%s”, str) …no necessary write: &str! *We know, str cnt in [0]-index. If we need [1] index to it starting than write this approach: (str+1)=[1-index]. *(&str[1])..hcce atr...
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