Check the difficulty of problems Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 5457   Accepted: 2400 Description Organizing a programming contest is not an easy job. To avoid making the problems too difficult, the organizer usually exp…

poj double 就得交c++,我交G++错了一次 题目:http://poj.org/problem?id=2151 题意:ACM比赛中,共M道题,T个队,pij表示第i队解出第j题的概率 问 每队至少解出一题且冠军队至少解出N道题的概率. 每队均至少做一题的概率P1 减去 每队做题数均在1到N-1之间的概率P2 设dp[i][j][k]表示第i个队在前j道题中解出k道的概率 则: dp[i][j][k]=dp[i][j-1][k-1]*p[j][k]+dp[i][j-1][k]*(1-p…

题意:给出m.t.n,接着给出t行m列,表示第i个队伍解决第j题的概率. 现在让你求:每个队伍都至少解出1题,且解出题目最多的队伍至少要解出n道题的概率是多少? 思路:求补集. 即所有队伍都解出题目的概率,减去所有队伍解出的题数在1~n-1之间的概率 这里关键是如何求出某个队伍解出的题数在1~n-1之间的概率,采用dp的方法: 用p(i,j)表示前i道题能解出j道的概率,有p(i,j)=p(i-1,j)*(1-p(i))+p(i-1,j-1)*p(i)p(i)表示解出第i题的概率. #inclu…

http://poj.org/problem?id=2151 看的题解..表示没看懂状态转移方程.. #include<stdio.h> #include<string.h> int m,t,n; ][][],p[][],tt[][]; int main() { int i,j,k; while(~scanf("%d%d%d",&m,&t,&n)) { if (!m && !t && !n) break;…

Check the difficulty of problems Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4522   Accepted: 1993 Description Organizing a programming contest is not an easy job. To avoid making the problems too difficult, the organizer usually exp…

Check the difficulty of problems Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4512   Accepted: 1988 Description Organizing a programming contest is not an easy job. To avoid making the problems too difficult, the organizer usually exp…

题目链接: http://poj.org/problem?id=2151 Check the difficulty of problems Time Limit: 2000MSMemory Limit: 65536K 问题描述 Organizing a programming contest is not an easy job. To avoid making the problems too difficult, the organizer usually expect the contes…

以前做过的题目了....补集+DP        Check the difficulty of problems Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4091   Accepted: 1811 Description Organizing a programming contest is not an easy job. To avoid making the problems too difficult,…

Check the difficulty of problems Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8903   Accepted: 3772 Description Organizing a programming contest is not an easy job. To avoid making the problems too difficult, the organizer usually exp…

Check the difficulty of problems Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4748   Accepted: 2078 Description Organizing a programming contest is not an easy job. To avoid making the problems too difficult, the organizer usually exp…