hdu 1203 I NEED A OFFER!（动态0-1背包）

 

题意：求被录取的概率

连接：http://acm.hdu.edu.cn/showproblem.php?pid=1203

#include <iostream>
using namespace std;
const int MAX=10000+10;
int v[MAX];
double w[MAX];
double dp[MAX];
double cmp(double a,double b)
{
    return a>b?a:b;
}
int main()
{
    int n,m;
    while(scanf("%d%d",&n,&m),n+m)
    {
        memset(w,0,sizeof(w));
        memset(v,0,sizeof(v));
        memset(dp,0,sizeof(dp));
        //for(int i=1;i<MAX)
        for(int i=1;i<=m;i++)
        {
            scanf("%d%lf",&v[i],&w[i]);        }
        for(i=1;i<=m;i++)
        {
            for(int j=n;j>=v[i];j--)
            {
                dp[j]=cmp(dp[j],1-(1-dp[j-v[i]])*(1-w[i]));
            }
        }
        printf("%.1lf%%\n",100*dp[n]);
    }
    return 0;
}