10 3
4 0.1
4 0.2
5 0.3
0 0

44.0%

Hint

You should use printf("%%") to print a ‘%‘.

#include<bits/stdc++.h>

using namespace std;

double dp[10005],p[10005];
int i,j,s[10005],n,m;

int main()
{
    while(scanf("%d%d",&n,&m)&&(!(m==0&&n==0)))
    {
        for(i=1;i<=m;i++)
        {
            cin>>s[i]>>p[i];
        }
        for(i=0;i<=n;i++)
        dp[i]=1.0;
        for(i=1;i<=m;i++)
        {
            for(j=n;j>=s[i];j--)
            {
                dp[j]=min(dp[j],dp[j-s[i]]*(1.0-p[i]));
            }
        }
        printf("%.1lf%%\n",(1-dp[n])*100);
    }
}