题目链接 https://vjudge.net/problem/CodeForces-1121C 题面 Description Vasya likes taking part in Codeforces contests. When a round is over, Vasya follows all submissions in the system testing tab. There are \(n\) solutions, the \(i\)-th of them should be t…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud System Administrator Bob got a job as a system administrator in X corporation. His first task was to connect n servers with the help of m two-way direct connection so that it becomes possible…

847H - Load Testing 思路:dp. 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define mem(a,b) memset(a,b,sizeof(a) ; ll dp[N]={}; ll dp1[N]={}; ll a[N]; ll t[N]={}; ll t1[N]={}; int main() { ios::sync_with_st…

 Registration system A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site administration wants to launch their project as soon as possible, that's why they ask you to help. You're suggested to implement…

来翻译一下官方文档,但是建议看英文原文,本文可能会出现一些错误,虽然不是为了方便自己查阅用的. 首先,对于人 \(i\),定义 \(r_i\) 是他的 rating,对于人 \(i,j\),定义 \(P_{i,j}\) 为在一场比赛中 \(i\) 比 \(j\) 强的概率. Codeforces 想尽力让这个柿子成立: \[P_{i,j}=\frac{1}{1+10^{\frac{r_j-r_i}{400}}}\] 一场比赛开始前,定义 \(seed_i\) 为第 \(i\) 个人的期望排名.明…

把v和2结点交换, 1和v连,其它点和v之间能够互相连. #include <iostream> #include <cstdlib> #include <cstring> #include <string> #include <cstdio> #include <cmath> #include <algorithm> using namespace std; int n,m,v,flag,i,cnt,j; int mai…

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A. Is it rated? time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Is it rated? Here it is. The Ultimate Question of Competitive Programming, Codeforces, and Everything. And you are here to a…

地址:http://codeforces.com/contest/807/problem/D 题目: D. Dynamic Problem Scoring time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Vasya and Petya take part in a Codeforces round. The round las…

D. Dynamic Problem Scoring time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Vasya and Petya take part in a Codeforces round. The round lasts for two hours and contains five problems. For th…