Codeforces Round #797 (Div. 3) (E. Price Maximization)

Bismillahir Rahmanir Rahim
///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

int main()
{
    ll tst,n,k;
    cin>>tst;
    while(tst--)
    {
        vector<ll>vec;
        cin>>n>>k;
        ll arr[n+7],sum=0;
        for(ll i=1;i<=n;i++)
        {
            cin>>arr[i],sum+=(arr[i]/k);
            if((arr[i]%k)!=0) vec.push_back(arr[i]%k);
        }
        sort(vec.begin(),vec.end());
        ll pos=vec.size()-1;
        for(ll i=0;i<vec.size() && i<pos;i++)
            if(vec[i]+vec[pos]>=k) sum++,pos--;
        cout<<sum<<endl;
    }
    return 0;
}

Problem Link: https://codeforces.com/contest/1690/problem/E

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