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…

题目链接:http://codeforces.com/contest/459/problem/D 题意:给出数组a,定义f(l,r,x)为a[]的下标l到r之间,等于x的元素数.i和j符合f(1,i,a[i])>f(j,n,a[j]),而且要求i<j,求i和j的种类数. 题解:先预处理一下设map be[a[i]]表示f(1,i,a[i])的值,然后在倒着来设af[a[j]]表示f(j,n,a[j])的值. 然后再用线段树更新一下长度为af[a[j]]的值然后再在树上查询小于be[a[j-1]…

[链接] 我是链接,点我呀:) [题意] 定义两个函数 f和g f(i)表示a[1..i]中等于a[i]的数字的个数 g(i)表示a[i..n]中等于a[i]的数字的个数 让你求出来(i,j) 这里i<j 的二元组个数 且f(i)>g(j) [题解] 求出来两个数组g[N]和f[N]; (用map就行) 要算出(i< j)且f[i]>g[j]的个数 我们可以先把 g[1..n]全都加入到树状数组中. 然后顺序枚举i 遇到i就把g[i]从树状数组中删掉. 这样就只包括g[i+1..n…

Pashmak and Parmida's problem Time Limit:3000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 459D Description Parmida is a clever girl and she wants to participate in Olympiads this year. Of course she…

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 partn…

BZOJ_2298_[HAOI2011]problem a_线段树 Description 一次考试共有n个人参加,第i个人说:“有ai个人分数比我高,bi个人分数比我低.”问最少有几个人没有说真话(可能有相同的分数) Input 第一行一个整数n,接下来n行每行两个整数,第i+1行的两个整数分别代表ai.bi Output 一个整数,表示最少有几个人说谎 Sample Input 3 2 0 0 2 2 2 Sample Output 1 HINT 100%的数据满足: 1≤n≤100000 …

Codeforces Round #620 F2. Animal Observation (hard version) (dp + 线段树) 题目链接 题意 给定一个nm的矩阵,每行取2k的矩阵,求总共矩阵里的数的和最大值,重复取到的数不算 题解 dp[i]表示当前行从第i个数开始取矩阵的最大值 dp[i] = 上一行中最大数 + 当前行第i个数到第i+k-1个数的和 - 当前行重复的 + 下一行第i个数到第i+k-1个数的和 用线段树维护 上一行中最大数 + 当前行第i个数到第i+k-1个数的…

C. Drazil and Park 题目连接: http://codeforces.com/contest/516/problem/C Description Drazil is a monkey. He lives in a circular park. There are n trees around the park. The distance between the i-th tree and (i + 1)-st trees is di, the distance between t…

题目链接: http://codeforces.com/problemset/problem/444/C J. DZY Loves Colors time limit per test:2 secondsmemory limit per test:256 megabytes 问题描述 DZY loves colors, and he enjoys painting. On a colorful day, DZY gets a colorful ribbon, which consists of…

D. Vika and Segments 题目连接: http://www.codeforces.com/contest/610/problem/D Description Vika has an infinite sheet of squared paper. Initially all squares are white. She introduced a two-dimensional coordinate system on this sheet and drew n black hor…