Card game

#include <algorithm>
#include <iostream>
#include <utility>
#include <vector>
int main(){
  int n;
  std::cin >> n;
  std::vector<std::pair<int, int>> cards(n); //first is card value, second is card index
  std::vector<std::pair<int, int>*> cardsPtr(n);
  std::vector<bool> cardsTaken(n, false);
  for(int i = 0; i<n; ++i){
    std::cin >> cards[i].first;
    cards[i].second = i;
    cardsPtr[i] = &cards[i];
  }

  auto cmp = [](std::pair<int, int>* a, std::pair<int, int>* b){
    return a->first < b->first;
  };

  std::sort(cardsPtr.begin(), cardsPtr.end(), cmp);

  int i = n-1;
  int score = 0;
  while(i>=0){
    int index = cardsPtr[i]->second;
    if (index>0 && index < n-1 && !cardsTaken[index] && !cardsTaken[index-1] && !cardsTaken[index+1]){
      score += cards[index].first;
      cardsTaken[index] = true;
      cardsTaken[index-1] = true;
      cardsTaken[index+1] = true;
    }
    --i;
  }

  std::cout << score << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER