Simple Statistics Codechef Problem Solution

https://www.codechef.com/problems/SIMPSTAT

In C++..........................

    #include <bits/stdc++.h>

    using namespace std;

    int main()

    {
       int t,a,b,c;
       cin>>t;
       while(t--)
       {
           cin>>a>>b;
           long long anf=0;
           vector<long long>joy;
           while(a--)
           {
               cin>>c;
               anf=anf+c;
               joy.push_back(c);
           }
           sort(joy.begin(),joy.end());
           long long sum=0;
           for(int j=0;j<=b-1;j++)
           {

              sum=sum+joy[j];
           }
           for(int j=joy.size()-1;j>=joy.size()-(b);j--)
           {
               sum=sum+joy[j];
           }
           double ans=(double)(anf-sum);
           double l=(double)(joy.size()-(2*b));
           printf("%.06lf\n",ans/l);
       }
       return 0;
    }