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…
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…
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: …
poj 3225 这题是用线段树解决区间问题,看了两天多,算是理解一点了. 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…
id=1716">[POJ 1716]Integer Intervals(差分约束系统) Integer Intervals Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 13425 Accepted: 5703 Description An integer interval [a,b], a < b, is a set of all consecutive integers beginning with…
