Cent saving

#include <bits/stdc++.h>

#define i64 long long
using namespace std;

int main(){
  cin.sync_with_stdio(0);
  cin.tie(0);
  
  int tests; cin >> tests;
  int p[101010];
  while(tests--){
    int n; cin >> n;
    i64 sum = 0;
    for(int i = 0; i < n; i++){
      cin >> p[i];
      if(p[i]%5 < 3)
	sum+=p[i]-p[i]%5;
      else
	sum+=p[i]+(5-p[i]%5);
    }
    i64 c[5] = {0};
    
    for(int i = 0; i < n; i++)
      c[p[i]%5]++;
    i64 be = 0;
    i64 m34 = min(c[3], c[4]);
    be = max(be, m34*5LL+(c[3]-m34)/2LL*5LL+(c[4]-m34)/2LL*5LL);
    be = max(be, c[3]/2LL*5LL+c[4]/2LL*5LL-(((c[3]&1) & (c[4]&1))*5LL));
    cout << sum-be << endl;
  }
    
    
  return 0;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER