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题目链接：https://vjudge.net/contest/66989#problem/E 坑爹的线段树照着上一个线段树更新写的，结果发现有一个地方就是不对，找了半天，发现是延迟更新标记加错了！！！以后一定要小心这一点 不用query，用value【1】也能ac，但是时间要的多，不知道是为什么， 阅读全文
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The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has a very poor system of public highways. The Flatopian government is aware 阅读全文
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The Department of National Defence (DND) wishes to connect several northern outposts by a wireless network. Two different communication technologies a 阅读全文
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have just moved from a quiet Waterloo neighbourhood to a big, noisy city. Instead of getting to ride your bike to school every day, you now get to wal 阅读全文
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动物王国中有三类动物A,B,C，这三类动物的食物链构成了有趣的环形。A吃B， B吃C，C吃A。 现有N个动物，以1－N编号。每个动物都是A,B,C中的一种，但是我们并不知道它到底是哪一种。 有人用两种说法对这N个动物所构成的食物链关系进行描述： 第一种说法是"1 X Y"，表示X和Y是同类。 第二种 阅读全文
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An earthquake takes place in Southeast Asia. The ACM (Asia Cooperated Medical team) have set up a wireless network with the lap computers, but an unex 阅读全文