题目链接: D. Vika and Segments time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Vika has an infinite sheet of squared paper. Initially all squares are white. She introduced a two-dimensional co…

题目链接: Atlantis Time Limit: 2000/1000 MS (Java/Others)     Memory Limit: 65536/32768 K (Java/Others) Problem Description There are several ancient Greek texts that contain descriptions of the fabled island Atlantis. Some of these texts even include ma…

扫描线:http://www.cnblogs.com/scau20110726/archive/2013/04/12/3016765.html 看图,图中的数字是横坐标离散后对应的下标,计算时左端点不变,右端点加1,所以总的更新的区间是l到r-1. 也可以理解为1代表的是(1到2这一段),2代表的是(2到3这一段),3代表的是(3到4这一段)... 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #de…

time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output Vika has an infinite sheet of squared paper. Initially all squares are white. She introduced a two-dimensional coordinate system on this sheet a…

F. MEX Queries time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a set of integer numbers, initially it is empty. You should perform n queries. There are three different types…

posters 时间限制:1000 ms  |  内存限制:65535 KB 难度:6   描述 The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim. The city council has finally de…

Mayor's posters Time Limit: 1000MS    Memory Limit: 65536K   Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim. The cit…

题目链接:http://acm.sgu.ru/problem.php?contest=0&problem=180 解题报告:一个裸的求逆序对的题,离散化+线段树,也可以用离散化+树状数组.因为这题中的数列有重复的而且范围特别大,所以要进行离散化,离散化的方法是, 首先按照输入的数字排个序,然后把整个数列扫一遍,得出每个数字离散化的结果,然后再按照输入的顺序把顺序调整回来就OK 了.线段树部分就不说了. #include<cstdio> #include<cstring> #…

1721: 感恩节KK专场——雪人的高度 时间限制: 1 Sec  内存限制: 128 MB 提交: 81  解决: 35 [提交][状态][讨论版] 题目描述 大雪过后,KK决定在春秋大道的某些区间上堆雪人.现在KK遇到了一道统计雪人高度的难题,请你帮帮他吧.注:KK堆雪人前春秋大道上是没有雪人的即所有位置雪人高度为0. 输入 给定一个整数t,表示有t(t<=5)组测试数据.每组测试数据有两个整数N(1<=N<=200000),表示N次操作. 操作分四种:    U1 x y v  …

[BZOJ1645][Usaco2007 Open]City Horizon 城市地平线 Description Farmer John has taken his cows on a trip to the city! As the sun sets, the cows gaze at the city horizon and observe the beautiful silhouettes formed by the rectangular buildings. The entire ho…

原文地址:http://www.cnblogs.com/GXZlegend/p/6801379.html 题目描述 蒟蒻DCrusher不仅喜欢玩扑克,还喜欢研究数列 题目描述 DCrusher有一个数列,初始值均为0,他进行N次操作,每次将数列[a,b)这个区间中所有比k小的数改为k,他想知道N次操作后数列中所有元素的和.他还要玩其他游戏,所以这个问题留给你解决. 输入 第一行一个整数N,然后有N行,每行三个正整数a.b.k. N<=40000 , a.b.k<=10^9 输出 一个数,数列…

题目传送门 题意:给出一些花开花落的时间,问某个时间花开的有几朵 分析:这题有好几种做法,正解应该是离散化坐标后用线段树成端更新和单点询问.还有排序后二分查找询问点之前总花开数和总花凋谢数,作差是当前花开的数量,放张图易理解: 还有一种做法用尺取法的思想,对暴力方法优化,对询问点排序后再扫描一遍,花开+1,花谢-1.详细看代码. 收获:一题收获很多:1. 降低复杂度可以用二分 2. 线段计数问题可以在端点标记1和-1 3. 离散化+线段树 终于会了:) (听说数据很水?) 代码1:离散化+线段树…

题目 题意: n(n<=10000) 个人依次贴海报,给出每张海报所贴的范围 li,ri(1<=li<=ri<=10000000) .求出最后还能看见多少张海报. 思路: 由于 li ri 都比较大,所以用离散化压缩一下空间,这里可以把所有的 li ri 都放在一个结构体数组 b[i] 中排序 再离散化. 不同的人涂的不同颜色的海报,颜色分别用1-n标记. add数组就是Lazy数组. 1. 涂第一种颜色所有节点 rt  ,都使它的add[rt]为当前颜色,说明这个节点包含的左右区…

链接:https://ac.nowcoder.com/acm/contest/992/B来源:牛客网 题目描述 在之前很火的一个动漫<干物妹小埋>中,大家对小埋打游戏喝可乐的印象十分的深刻. 现在欧尼酱将小埋的快乐水全部分开藏在了家具的顶端. 小埋使出空中1080°转身接战术翻滚跳到任一家具上,她相信,只要她翻滚的足够快,欧尼酱就跟不上她.   1.为获取梦幻开局,小埋一套技能可以使她一开始掉落在任一家具上. 2.小埋家的家具按顺序给出,每个家具可跳可不跳,为避开欧尼酱的追击,小埋翻滚到某个家…

传送门:http://bailian.openjudge.cn/practice/2528?lang=en_US //http://poj.org/problem?id=2528 题意: 给你n长海报,每张海报在墙上贴的区间范围是l,r 问你这n张海报贴完后,可以看见的海报数量是多少 题解: 离散化+线段树 因为l,r的数据范围是1e7,而题目只给了64MB的空间,直接存的话空间会炸掉,所以需用用到离散化的技巧 然后按照端点单点更新即可 现在重新写这题发现这个题坑点在于每一个点他都代表一个长度为…

D. Vika and Segments time limit per test:  2 seconds     memory limit per test:  256 megabytes input : standard input output:  standard output Vika has an infinite sheet of squared paper. Initially all squares are white. She introduced a two-dimensio…

[Codeforces]817F. MEX Queries You are given a set of integer numbers, initially it is empty. You should perform n queries. There are three different types of queries: 1 l r — Add all missing numbers from the interval [l, r] 2 l r — Remove all present…

D. Zip-line 题目连接: http://www.codeforces.com/contest/650/problem/D Description Vasya has decided to build a zip-line on trees of a nearby forest. He wants the line to be as long as possible but he doesn't remember exactly the heights of all trees in t…

题目链接: D. Nested Segments time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given n segments on a line. There are no ends of some segments that coincide. For each segment find the num…

http://www.lightoj.com/volume_showproblem.php?problem=1089 题意:给出许多区间,查询某个点所在的区间个数 思路:线段树,由于给出的是区间,查询的是点,考虑将其离线并离散化,普通线段树即可. /** @Date : 2016-12-17-20.49 * @Author : Lweleth (SoungEarlf@gmail.com) * @Link : https://github.com/ * @Version : */ #include…

题目链接: D. Pashmak and Parmida's problem time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Parmida is a clever girl and she wants to participate in Olympiads this year. Of course she wants her…

Codeforces 题目传送门 & 洛谷题目传送门 感觉这个 *2900 并不难啊,为什么我没想出来呢 awa 顺便膜拜 ycx 一眼秒掉此题 %%% 首先碰到这类题有两种思路,一是枚举两个区间,显然这个思路是不可行的,因为这个思路有四个自由变量 \(l_1,r_1,l_2,r_2\),并且还会出现重复计算的情况,非常棘手.二是注意到 \([l_1,r_1]\cup[l_2,r_2]\) 是一段连续的区间,故考虑枚举这段区间值域的左右端点 \([l,r]\),我们只需统计有多少个区间 \([l…

题目:http://codeforces.com/contest/629/problem/D 题意:有n个蛋糕要叠起来,能叠起来的条件是蛋糕的下标比前面的大并且体积也比前面的大,问能叠成的最大体积 思路:DP[i]表示拿到第i个蛋糕时最多能叠成的体积,转移就是这样DP[i]=max(DP[1...i])+V[i];如果直接做的话复杂度是n^2的,用线段树维护比它小的蛋糕的能叠的最大体积,事先离散化, #include <cstdio> #include <cstring> #inc…

codeforces 811E Vladik and Entertaining Flags 题面 \(n*m(1<=n<=10, 1<=m<=1e5)\)的棋盘,每个格子有一个值. 定义联通块:联通块中所有格子的值相等,并且格子四联通. \(1e5\)次询问,每次询问子矩形\((1, l, n, r)\)中联通块的数量. 题解 线段树区间合并. \(cnt[rt]\):区间中联通块个数 \(pre[rt][]\):在区间中用并查集维护端点的连通性.在给合并之后的集合重新编号时,要注…

posters 时间限制: 1000ms 内存限制: 128000KB 64位整型:      Java 类名: 上一题 提交 运行结果 统计 讨论版 下一题 题目描述 The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their w…

任意门:http://poj.org/problem?id=2528 Mayor's posters Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 77814   Accepted: 22404 Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign hav…

The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim. The city council has finally decided to build an electoral wall for placing the…

Mayor's posters Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 70365   Accepted: 20306 Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral post…

题目链接:http://codeforces.com/contest/522/problem/D 题目大意:  给你一个长度为n的序列,然后有m次查询,每次查询输入一个区间[li,lj],对于每一个查询,输出在这个区间内的两个相等的数的最短距离,如果没有相等的则输出-1. 线段树+扫描线,线段树维护的值是区间的最小值,从后往前扫,然后每次要做的事有两个: 1.判断当前这个位置 i 的数刚刚是不是出现过,假设刚刚出现的位置是 l ,如果出现过,则在线段树中把l这个位置的值更新为 l - i,同时更…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5153 In an infinite chess board, some pawns are placed on some cells.You have a rectangular bomb that is W width and H…