Sum of sub set algorithm

#include<bits/stdc++.h>
using namespace std;
int w[100000],x[100000],m,n;
class SumofsubSet{
public:
    void sum(int s,int k,int r)
    {
        x[k] = 1;
        if(s+w[k] == m)
        {
            display(k);
        }

        else if (s+w[k]+w[k+1]<=m)
            sum(s+w[k],k+1,r-w[k]);

        if((((s+r)-w[k])>=m) &&(s+w[k+1])<=m)
        {
            x[k] = 0;
            sum(s,k+1,r-w[k]);
        }
    }
    void display(int k)
    {
        for(int i=1;i<=k;i++)
        {
            if( x[i] == 1)
                cout<<w[i]<<" ";
        }
        cout<<endl;
    }
};
int main()
{
    ifstream fin("input.txt", ios::in) ;
    //freopen("input.txt","r",stdin);
    SumofsubSet ss;
    fin>>n>>m;
    int total = 0;
    for(int i =1; i<=n;i++)
    {
        fin>>w[i];
        total = total+ w[i];
    }

//    outfile.open("input.txt");
//     outfile.close();
fin.close();
    int a,b,c;
    cin>>a>>b;
    cout<<a<<b;
    ss.sum(0,1,total);
}