dp--最大区间和变形-cf-1155D D. Beautiful Array time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an array aa consisting of nn integers. Beauty of array is the maximum sum of some cons…
C. Vasya and String time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output -> Link <- 题目就不贴出来了,链接在上面: 题意:给定n,k,然后是一个长度为n的只含字母a.b的字符串,问至多改变k次使得一个子串字母都相同且长度最大,如所给样例: input 10 1 bbabbabbba output…
Description "Fat and docile, big and dumb, they look so stupid, they aren't much fun..." - Cows with Guns by Dana Lyons The cows want to prove to the <= N <= ) cows a thorough interview and determined two values <= Si <= ) of the cow…
B. Hamming Distance Sum time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Genos needs your help. He was asked to solve the following programming problem by Saitama: The length of some string…
Perfect Service Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 1518 Accepted: 733 Description A network is composed of N computers connected by N − 1 communication links such that any two computers can be communicated via a unique rou…
Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1*1 or greater located within the whole array. The sum of a rectangle is the sum of all the elements in that rectangle. I…
Palindrome Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 53431 Accepted: 18454 Description A palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. You are to write a…
题意 : 可以选择操作一串区间,将区间内的某一个数全部变成一个新的数字,询问整个区间中某个数字的出现次数总共有多少个? 思路分析 : 首先最后选的一定是一个区间,然后 ans = cnt(1, l-1, c)+cnt(r+1, n, c)+cnt(l, r, d) ans = cnt(1, n, c) - cnt(l, r, c) + cnt(l, r, d) 即,我们只需要最大化 l - r 内的 d - c 的个数,其实就是个最大区间和的变化版本,统计一个数时,当这个数的的个数小于C的个数时…
简单的检查括号是否配对正确使用的是栈模拟,这个不必再说,现在将这个问题改变一下:如果给出一个括号序列,问需要把他补全成合法最少需要多少步? 这是一个区间dp问题,我们可以利用区间dp来解决,直接看代码吧! /* *********************************************** Author :xiaowuga Created Time :2017年10月03日 星期二 14时20分04秒 File Name :Desktop/text.cpp ***********…