D2. RGB Substring (hard version) inputstandard input outputstandard output The only difference between easy and hard versions is the size of the input. You are given a string…

一.题目 D2. RGB Substring (hard version) 二.分析 思路一开始就想的对的,但是,用memset给数组初始化为0超时了!超时了! 然后我按照题解改了个vector初始化,就过了! 以后得谨慎使用memset了. 三.AC代码 1 #include <bits/stdc++.h> 2 3 using namespace std; 4 #define ll long long 5 #define Min(a,b) (a)>(b)?(b):(a) 6 const…

传送门 题意: 给你一个长为n的仅由'R','G','B'构成的字符串s,你需要在其中找出来一个子串.使得这个子串在"RGBRGBRGBRGB........(以RGB为循环节,我们称这个串为str)"里面也是一个子串,这个子串的长度是k 可是有可能s字符串中找不到,那么这个时候就可以改变s字符串中某些位置的字母来完成任务.问最少需要改变多少个字母 题解: 主要看暴力的姿势对不对.在上一道的D1上面,我是对s字符串的每一个位置进行'R','G','B'的枚举,因为如果这个子串也是str…

B1. Character Swap (Easy Version) This problem is different from the hard version. In this version Ujan makes exactly one exchange. You can hack this problem only if you solve both problems. After struggling and failing many times, Ujan decided to tr…

Brain's Photos 题目链接: http://codeforces.com/contest/707/problem/A Description Small, but very brave, mouse Brain was not accepted to summer school of young villains. He was upset and decided to postpone his plans of taking over the world, but to becom…

传送门:http://codeforces.com/contest/1092/problem/D2 D2. Great Vova Wall (Version 2) time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Vova's family is building the Great Vova Wall (named by Vo…

题目链接:https://codeforces.com/contest/1203/problem/D2 题意: 给你S串.T串,问你最长删除多长的子串使得S串里仍然有T的子序列. 思路: 想了好久,先正着跑一下S串,记录T串每一个字符最左边在哪里,再倒着跑一下,记录T串的每一个字符最右边在哪里. 最后跑一下答案: 1. 开头和结尾特判一下,但不是max( L[1]-1 , l1-R[l2] ) , 而是对两个max( L[1]-1 , l1-L[l2]-1 ).max( R[1]-1 , l1-…

C. Efim and Strange Grade 题目连接: http://codeforces.com/contest/719/problem/C Description Efim just received his grade for the last test. He studies in a special school and his grade can be equal to any positive decimal fraction. First he got disappoin…

A. Whose sentence is it? Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/312/problem/A Description One day, liouzhou_101 got a chat record of Freda and Rainbow. Out of curiosity, he wanted to know which sentences were said…

A. Vitya in the Countryside 题目连接: http://codeforces.com/contest/719/problem/A Description Every summer Vitya comes to visit his grandmother in the countryside. This summer, he got a huge wart. Every grandma knows that one should treat warts when the…