题目链接:https://codeforces.com/contest/1359/problem/D 题意 有一个大小为 $n$ 的数组,可以选取一段连续区间去掉其中的最大值求和,问求和的最大值为多少. 题解 枚举所有可能的情况,其中一定有一个是正确答案. 即每次枚举去掉的最大值,取最大连续子序列的和. 代码 #include <bits/stdc++.h> using namespace std; int main() { int n; cin >> n; int a[n] =…

题意就是给出多个区间,要求去掉两个区间,使得剩下的区间覆盖范围最大. 当然比赛的时候还是没能做出来,不得不佩服大佬的各种姿势. 当时我想的是用线段树维护区间和,然后用单点判0,维护区间间断个数.然后打到一半,就发现想法有问题. 这道题正解就是简单的前缀和,或者DP. 我为了更加深入理解,两种方法都试了试. 前缀和版本: 由于题目给的范围是5000,明显支持N^2,于是我们枚举去掉的两个,刚好满足,那么要如何才能O(1)的得到答案? 我们其实可以这样,我们知道它的总覆盖的数目,这是非常容易求出的.…

C. Brutality time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are playing a new famous fighting game: Kortal Mombat XII. You have to perform a brutality on your opponent's character. You…

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Problem   Educational Codeforces Round 60 (Rated for Div. 2) - C. Magic Ship Time Limit: 2000 mSec Problem Description Input Output The only line should contain the minimal number of days required for the ship to reach the point (x2,y2)(x2,y2). If it…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - D. Magic Gems Time Limit: 3000 mSec Problem Description Input The input contains a single line consisting of 2 integers N and M (1≤N≤10^18, 2≤M≤100). Output Print one integer, the total n…

Educational Codeforces Round 43 (Rated for Div. 2) https://codeforces.com/contest/976 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(x)…

Educational Codeforces Round 35 (Rated for Div. 2) https://codeforces.com/contest/911 A 模拟 #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) F. Isomorphic Strings 题目连接: http://codeforces.com/contest/985/problem/F Description You are given a string s of length n consisting of lowercase English letters. For two given strings s an…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) E. Pencils and Boxes 题目连接: http://codeforces.com/contest/985/problem/E Description Mishka received a gift of multicolored pencils for his birthday! Unfortunately he lives in a monochrome w…