1930A - Maximise The Score - CodeForces Solution

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
    ll t;
    cin>>t;
    for(int j=0;j<t;j++){
        ll n;
        cin>>n;
        vector<int> v;
        for(int i=0;i<2*n;i++){
            int x;
            cin>>x;
            v.push_back(x);
        }

        sort(v.begin(),v.end());

        ll sum = 0;

        for(int i=0;i<2*n;i=i+2){
            sum = sum + min(v[i],v[i+1]);
        }

        cout<<sum<<endl;
    }
    
    return 0;
}