B. Mike and Children time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike decided to teach programming to children in an elementary school. He knows that it is not an easy task to interest…

A. Technogoblet of Fire 题意:n个人分别属于m个不同的学校 每个学校的最强者能够选中 黑客要使 k个他选中的可以稳被选 所以就为这k个人伪造学校 问最小需要伪造多少个 思路:记录每个学校都有哪些人 每次看黑客选中的人是不是在学校是最强者(这里要处理能力一样的情况,如果有能力一样的为了保证稳进也要伪造一个学校) 然后就是模拟了 #include<bits/stdc++.h> #define FOR(i,f_start,f_end) for(int i=f_start;i&…

题面戳这里 A. Diana and Liana 首先如果s>ks>ks>k一定无解,特判一下.那么我们考虑找恰好满足满足题目中的要求的区间[l,r][l,r][l,r],那么需要要删去的数一定是(l−1)%k+max((r−l+1)−k,0)(l-1)\%k+max((r-l+1)-k,0)(l−1)%k+max((r−l+1)−k,0).前面的表示要把[1,l−1][1,l-1][1,l−1]区间删成kkk的倍数,后面的表示要把这个区间删到kkk长度以内.判断这个值是否不大于能够删的…

Codeforces Round #517 (Div. 2, based on Technocup 2019 Elimination Round 2) #include <bits/stdc++.h> using namespace std; int n,m,k; ; int main() { cin>>n>>m>>k; ;i<=k-;++i) { sum+=(n+(m-))*-(i)*; } cout<<sum<<endl;…

A. Right-Left Cipher time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Polycarp loves ciphers. He has invented his own cipher called Right-Left. Right-Left cipher is used for strings. To encr…

http://codeforces.com/contest/1072/problem/D bfs 走1步的最佳状态 -> 走2步的最佳状态 -> …… #include <bits/stdc++.h> using namespace std; #define ll long long #define minv 1e-6 #define inf 1e9 #define pi 3.1415926536 #define nl 2.7182818284 ; ; struct node {…

https://codeforces.com/contest/1072/problem/D 题意 给你一个n*n充满小写字母的矩阵,你可以更改任意k个格子的字符,然后输出字典序最小的从[1,1]到[n,n]的路径(1<=n<=2000) 思路 我的 定义dp[i][j]为从[1,1]到[i,j]字符串最小的字符串,然后枚举所有i-1+j-1+1<=k的点,然后字符串连接比较,代表更改前面i,j个字符 这种思路有两个问题,如何处理出从[i,j]到[n,n]的最小字典序字符串,第二假如i+j…

传送门:http://codeforces.com/contest/1087/problem/C C. Connect Three time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output The Squareland national forest is divided into equal 1×11×1 square plots al…

任意门:http://codeforces.com/contest/1058/problem/C C. Vasya and Golden Ticket time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Recently Vasya found a golden ticket — a sequence which consists…

The last stage of Football World Cup is played using the play-off system. There are n teams left in this stage, they are enumerated from 1 to n. Several rounds are held, in each round the remaining teams are sorted in the order of their ids, then the…