[email protected] http://acm.hdu.edu.cn/showproblem.php?pid=5999
[email protected] Sycamore
[email protected] Aug, 16
#include<bits/stdc++.h>
using namespace std;
int main()
{
   ios::sync_with_stdio(false);
   cin.tie(0);
    int T;
   cin>>T;
   for(int t=1;t<=T;t++)
   {
      int 
 
n;
      cin>>n;
      vector<unsigned short>p(n);
      for(auto &e:p)cin>>e;
      sort(p.begin(),p.end());
      int ans=0;
      for(int i=n-1;i>=0;i-=3)
         ans+=p[i];
      for(int i=n-2;i>=0;i-=3)
         ans+=p[i];
      cout<<"Case #"<<t<<": "<<ans<<
 
‘\n‘;
   }
    return 0;
}

HDU 5999: The Third Cup is Free