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摘要: 百度搜索爱国呐博客园最小生成树概念:一个有 n 个结点的连通图的生成树是原图的极小连通子图,且包含原图中的所有 n 个结点,并且有保持图连通的最少的边。 最小生成树可以用kruskal(克鲁斯卡尔)算法或prim(普里姆)算法求出。最小生成树其实是最小权重生成树的简称... 阅读全文
posted @ 2018-08-08 10:32 ~~zcy 阅读(633) 评论(0) 推荐(0)
摘要: 容斥 mobius反演 https://blog.csdn.net/ZCY19990813/article/details/81065084vector详解 ... 阅读全文
posted @ 2018-08-07 21:06 ~~zcy 阅读(110) 评论(0) 推荐(0)
摘要: 转自 https://blog.csdn.net/Akatsuki__Itachi/article/details/80030929看了一些博客,感觉有些博客对建树写的挺好,但是对于查询区间却一笔带过。在看懂了之后决定自己写一篇,加深自己的理解,也希望对正在学习划分... 阅读全文
posted @ 2018-08-07 15:10 ~~zcy 阅读(212) 评论(0) 推荐(0)
摘要: Natasha is going to fly to Mars. She needs to build a rocket, which consists of several stages in some order. Each of the stages is de... 阅读全文
posted @ 2018-08-04 21:19 ~~zcy 阅读(138) 评论(0) 推荐(0)
摘要: cOne day Alex was creating a contest about his friends, but accidentally deleted it. Fortunately, all the problems were saved, but now... 阅读全文
posted @ 2018-08-04 11:07 ~~zcy 阅读(109) 评论(0) 推荐(0)
摘要: 不要62Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Subm... 阅读全文
posted @ 2018-08-03 10:14 ~~zcy 阅读(129) 评论(0) 推荐(0)
摘要: LCA 最近公共祖先 此博客主要介绍 Tajan(现在只了解这个算法)需要用到很多铺垫 比如前向星了 链式前向星了 并查集了 下面我们一一来介绍一下首先看一下前向星 前向星是一种数据结构,以储存边的方式来存储图 用到两个数组 len[i]是来表示以i为起... 阅读全文
posted @ 2018-08-02 14:23 ~~zcy 阅读(274) 评论(0) 推荐(0)
摘要: EEverybody in Russia uses Gregorian calendar. In this calendar there are 31 days in January, 28 or 29 days in February (depending on w... 阅读全文
posted @ 2018-08-02 13:22 ~~zcy 阅读(124) 评论(0) 推荐(0)
摘要: 转自 https://www.cnblogs.com/RabbitHu/p/BIT.html1. 单点修改 + 区间查询最简单的树状数组就是这样的:void add(int p, int x){ //给位置p增加x while(p #include#inclu... 阅读全文
posted @ 2018-07-31 16:08 ~~zcy 阅读(123) 评论(0) 推荐(0)
摘要: CA sequence a1,a2,…,an is called good if, for each element ai, there exists an element aj (i≠j) such that ai+aj is a power of two (tha... 阅读全文
posted @ 2018-07-31 13:24 ~~zcy 阅读(164) 评论(0) 推荐(0)
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