Nhờ giúp đỡ code để qua full bộ test

[Phuoc_Pham]

http://vinhdinhcoder.net/Problem/Details/5005

#include <bits/stdc++.h>

using namespace std;
int n;
long long  tw=0,cs[33],a[33],m;
void tim(int k)
{
    if(tw==m){
            cout<<"YES";
            exit(0);
    }
    for(int i=1;i<=n;i++)if(tw+a[i]<=m&&i>cs[k-1])
    {
        tw=tw+a[i];
        cs[k]=i;
        tim(k+1);
        tw=tw-a[i];
    }
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    #ifndef ONLINE_JUDGE
    freopen("a.inp","r",stdin);
    freopen("a.out","w",stdout);
    #endif
    cin>>n>>m;
    for(int i=1;i<=n;i++)cin>>a[i];
    cs[0]=0;
    tim(1);
    if(tw!=m)cout<<"NO";
    return 0;
}