timus 1005 backtrack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define test int t; cin>>t; while(t--)
ll a[100000],ans=10000000000,sum=0,n;
void backtrack(int index,int value)
{

    if(index==n)
    {
        ans=min(ans,abs((sum-value)-value));
        return;
    }
    else
    {
        backtrack(index+1,value);

        backtrack(index+1,value+a[index]);
        return;
    }
    return;
}
int main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);cout.tie(0);

   cin>>n;
   for(int i=0;i<n;i++)
   {
       cin>>a[i];
       sum+=a[i];
   }
   backtrack(0,0);

   cout<<ans<<endl;

   return 0;
}