Shopaholic

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#include<iostream>#include<algorithm>using namespace std;int a[20005];int main(){    int t;    cin>>t;    while(t--)    {        int n;        cin>>n;        int sum=0;        for(int i=0;i<n;i++)            cin>>a[i];            sort(a,a+n);            int m=n/3;            for(int j=1;j<=m;j++)            {                sum+=a[n-j*3];            }            cout<<sum<<endl;    }    return 0;}