Description LogLoader, Inc. is a company specialized in providing products for analyzing logs. While Ikki is working on graduation design, he is also engaged in an internship at LogLoader. Among his tasks, one is to write a module for manipulating ti…

Help with Intervals Time Limit: 6000MS   Memory Limit: 131072K Total Submissions: 12474   Accepted: 3140 Case Time Limit: 2000MS Description LogLoader, Inc. is a company specialized in providing products for analyzing logs. While Ikki is working on g…

题意:给你一些区间操作,让你输出最后得出的区间. 解法:区间操作的经典题,借鉴了网上的倍增算法,每次将区间乘以2,然后根据区间开闭情况做微调,这样可以有效处理开闭区间问题. 线段树维护两个值: cov 和 rev  ,一个是覆盖标记,0表示此区间被0覆盖,1表示被1覆盖,-1表示未被覆盖, rev为反转标记,rev = 1表示反转,0表示不翻转 所以集合操作可以化为如下区间操作: U l r:   把区间[l,r]覆盖成1I  l r:   把[0,l)(r,MAX]覆盖成0 D l r:  …

Description There is a number of disjoint vertical line segments in the plane. We say that two segments are horizontally visible if they can be connected by a horizontal line segment that does not have any common points with other vertical segments.…

POJ 3225 Help with Intervals 题目链接 集合数字有的为1,没有为0,那么几种操作相应就是置为0或置为1或者翻转,这个随便推推就能够了,然后开闭区间的处理方式就是把区间扩大成两倍,偶数存点,奇数存线段就可以 代码: #include <cstdio> #include <cstring> #define lson(x) ((x<<1)+1) #define rson(x) ((x<<1)+2) const int N = 65536…

POJ.2528 Mayor's posters (线段树 区间更新 区间查询 离散化) 题意分析 贴海报,新的海报能覆盖在旧的海报上面,最后贴完了,求问能看见几张海报. 最多有10000张海报,海报左右坐标范围不超过10000000. 一看见10000000肯定就要离散化了,因为建树肯定是建不下.离散化的方法是:先存到一个数组里面,然后sort,之后unique去重,最后查他离散化的坐标lower_bound就行了.特别注意如果是从下标为0开始存储,最后结果要加一.多亏wmr神犇提醒. 这题是…

Mayor's posters 转载自:http://blog.csdn.net/winddreams/article/details/38443761 [题目链接]Mayor's posters [题目类型]线段树+离散化 &题意: 给出一面墙,给出n张海报贴在墙上,每张海报都覆盖一个范围,问最后可以看到多少张海报 &题解: 海报覆盖的范围很大,直接使用数组存不下,但是只有最多10000张海报,也就是说最多出现20000个点,所以可以使用离散化,将每个点离散后,重新对给出控制的区间,这样…

题目链接:http://poj.org/problem?id=2528 题目大意:有一个很上的面板, 往上面贴海报, 问最后最多有多少个海报没有被完全覆盖 解题思路:将贴海报倒着想, 对于每一张海报只需要判断他要贴的位置是否已经全部被之前的海报覆盖就可以了, 如果没有被覆盖那么这个海报最后是没有被完全覆盖的, 如果被覆盖了, 那么最后是被完全覆盖的.标准的线段树题目. 代码如下: #include<stdio.h> #include<vector> #include<map&…

Tunnel Warfare Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 7876   Accepted: 3259 Description During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas of north China Plain. Generally sp…

Count Color Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 42940   Accepted: 13011 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here, we get a new problem.…