hdu 1203 I NEED A OFFER!

 

 

 

 

#include<stdio.h>#include<string.h>double min(double a,double b){    if(a<b)return a;    return b;}int main(){    int t,n,m,i,j,s,a[10001],k;    double b[10001],f[10001];        while(scanf("%d%d",&n,&m),n||m)    {        for(j=0;j<=n;j++)            f[j]=1.0;        for(i=0;i<m;i++)        scanf("%d%lf",&a[i],&b[i]);        for(i=0;i<m;i++)                      for(j=n;j>=a[i];j--)                    f[j]=min(f[j],f[j-a[i]]*(1-b[i]));                    printf("%.1f%%\n",(1-f[n])*100);    }    return 0;}