HDU2955-Robberies

http://acm.hdu.edu.cn/showproblem.php?pid=2955

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
double q[105],dp[10005];
int m[105];
int main(void)
{
    int t,n,i,j,sum;
    double p;
    scanf("%d",&t) ;
    while(t--)
    {
         scanf("%lf%d",&p,&n);
         sum=0;
         for(i=0;i<n;i++)
         {
             scanf("%d%lf",&m[i],&q[i]);
             sum+=m[i];
         }
         memset(dp,0,sizeof(dp));
         dp[0]=1.0 ;
         for(i=0;i<n;i++)
            for(j=sum;j>=m[i];j--)
               dp[j]=max(dp[j],dp[j-m[i]]*(1-q[i]));
         for(j=sum;j>=0;j--)
            if(dp[j]>=1-p)
            {
                printf("%d\n",j);
                break;
            }
     }
     return 0;
 }