Kortit

#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
 
using namespace std;
 
int n, half;
vector<int> a;
vector<int> answers;
 
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++;
      }
    }
  }
 
  answers.push_back(points);
}
 
int t;
int main() {
  cin >> t;
  for (int i = 0; i < t; i++) f();

  for (auto i : answers) {
    cout << i << "\n";
  }
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 2

Verdict: WRONG ANSWER