Partial Sum Accepted : Submit : Time Limit : MS Memory Limit : KB Partial Sum Bobo has a integer sequence a1,a2,…,an of length n. Each time, he selects two ends ≤l<r≤n and add |∑rj=l+1aj|−C into a counter which is zero initially. He repeats the selec…

Partial Sum Accepted : 80   Submit : 353 Time Limit : 3000 MS   Memory Limit : 65536 KB  Partial Sum Bobo has a integer sequence a1,a2,…,an of length n . Each time, he selects two ends 0≤l<r≤n and add |∑rj=l+1aj|−C into a counter which is zero initia…

In Chinese mythology, Pangu is the first living being and the creator of the sky and the earth. He woke up from an egg and split the egg into two parts: the sky and the earth. At the beginning, there was no mountain on the earth, only stones all over…

今日内容介绍 1.流程控制语句switch 2.数组 3.随机点名器案例 ###01switch语句解构     * A:switch语句解构       * a:switch只能针对某个表达式的值作出判断,从而决定程序执行哪一段代码.         * b:格式如下:          swtich(表达式){                  case 常量1 :                  要执行的语句;                  break;               …

题目链接  2017 ACM-ICPC Beijing Regional Contest Problem C 题意  给定一个$n$个点$m$条边的无向图.现在有$q$个询问,每次询问格式为$[l, r]$,即图中只有第$l$个点到第$r$个点是安全的,同时 对于某条边,如果他的两个端点都是安全的,那么这条边也是安全的. 求在该限制条件下能互相安全到达的点对数. update:原来这个姿势叫做回滚莫队. 首先要做的就是分块,但是这道题的块的大小很难控制. 从每个点开始按度数分块,保证每个块点的度…

orz 首先说一下这个只是民间题解,可能会有很多错误 程序还没有评测,所以可能存在问题 C题比赛的时候没想到..后来发现是个模板题,所以没有代码 希望这份题解能对读者有所启发吧... A题 直接倒序枚举即可 因为一个数n最短减sqrt(n)次就可以变成回文数 所以复杂度是sqrt(n)的 (也可以利用字符串做法,会更快) #include <iostream> #include <cstring> #include <cstdio> using namespace st…

The partial sum problem 时间限制:1000 ms  |  内存限制:65535 KB 难度:2 描写叙述 One day,Tom's girlfriend give him an array A which contains N integers and asked him:Can you choose some integers from the N integers and the sum of them is equal to K. 输入 There are mul…

C++ 的 STL 库的 <numeric> 头文件的 partial_sum 函数已实现了对某一序列的 partial sum. partial_sum(first, last, dest); 1. 部分和的引入 并非什么高级深奥的技巧,但却十分有用. 假设按照降序排列 N 个学生的考试成绩并保存到数组 scores[],现在想要编写求出从第 a 名到第 b 名成绩的函数 average(a, b),最简单的方法是,将 scores[a] 到 scores[b] 的乘积全部相加,然后除以 b…

描述 One day,Tom’s girlfriend give him an array A which contains N integers and asked him:Can you choose some integers from the N integers and the sum of them is equal to K.  输入 There are multiple test cases. Each test case contains three lines.The fir…

/* Name: NYOJ--927--The partial sum problem Author: shen_渊 Date: 15/04/17 19:41 Description: DFS,和 NYOJ--1058--dfs--部分和问题 基本一致,递归的i+1注意了,其他没什么 */ #include<cstring> #include<iostream> using namespace std; void dfs(int); ],vis[]; int n,k,sum,fla…