CountNum

vector<int> CountNum(vector<int> &a, int S)
{
    int suma=0,n=a.size(),i=0;
    sort(a.begin(),a.end());
    vector <int> b;
    while(suma<=S && i<n)
    {
        suma+=a[i];
        if(suma<=S)
            b.push_back(a[i]);
        ++i;
    }
    return b;
}