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啊，是否疲倦了现在的线段树太弱，还递归！那我们就欢乐的学习另外一种神奇的线段树吧！（雾他叫做zkw线段树这个数据结构灰常好写（虽然线段树本身也特别好写……）速度快（貌似只在单点更新方面比线段树快……)是一种自底向上非递归版本的线段树！首先我们来看一个ppt，《统计的力量》这个是发明人的PPT（啊，p... 阅读全文
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C. Xor-treeTime Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/contest/430/problem/CDescriptionIahub is very proud of his recent discovery,... 阅读全文
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B. Balls GameTime Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/contest/430/problem/BDescriptionIahub is training for the IOI. What is a b... 阅读全文
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A. Points and Segments (easy)Time Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/contest/430/problem/ADescriptionIahub isn't well prepared ... 阅读全文
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Tavas and KarafsTime Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/contest/536/problem/ADescriptionKarafs is some kind of vegetable in sha... 阅读全文
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B. Tavas and SaDDasTime Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/contest/535/problem/BDescriptionOnce again Tavas started eating coff... 阅读全文
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A. Tavas and NafasTime Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/contest/535/problem/ADescriptionToday Tavas got his test result as an... 阅读全文
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E. Roland and RoseTime Limit: 1 SecMemory Limit: 256 MB题目连接http://codeforces.com/problemset/problem/460/EDescriptionRoland loves growing flowers. He h... 阅读全文