Kortit

#include <iostream>
#include <vector>
#include <algorithm>
#include <set>

using namespace std;

int n, half;
vector<int> a;

void f() {
  cin >> n;
  half = n/2;

  a.clear();
  a.resize(half);
  
  for (int i = 0; i < half; i++) cin >> a[i];
  sort(a.begin(), a.end());

  int m = 0;
  int ia = 0;
  int points = 0;
  for (int i = 1; i <= n; i++) {
    if (a[ia] != i) {
      m++;
    } else {
      ia++;
      if (m > 0) {
        m--;
        points++;
      }
    }
  }

  cout << points << "\n";
}

int t;
int main() {
  cin >> t;
  for (int i = 0; i < t; i++) f();
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 2

Verdict: WRONG ANSWER