钞票面值问题

1.Otoshidama - AtCoder abc085_c - Virtual Judge (vjudge.net)

#include<bits/stdc++.h>
using namespace std;

int n,Y;

int main()
{
    while(cin >> n >> Y)
    {
        Y /= 1000;
        if(n * 10 < Y || n > Y){
            cout<<-1<<" "<<-1<<" "<<-1<<endl;
            continue;
        }
        int flag=0;
        for(int i=n;i>=0;i--){
            for(int j=n-i;j>=0;j--){
                for(int l=n-i-j;l>=0;l--){
                    if((i+j+l==n)&&(i*10+j*5+l==Y)){
                        cout<<i<<" "<<j<<" "<<l<<endl;
                        flag=1;
                        return 0;
                    }
                }
            }
        }
        if(!flag) cout<<-1<<" "<<-1<<" "<<-1<<endl;
    }
    return 0;
}