1#include <iostream>
2#include <vector>
3#include <algorithm>
4
5int specialArray(std::vector<int>& nums) {
6    std::sort(nums.begin(), nums.end());
7    int n = nums.size();
8    for (int x = 0; x <= n; ++x) {
9        int count = 0;
10        for (auto num : nums) {
11            if (num >= x) {
12                count++;
13            }
14        }
15        if (count == x) {
16            return x;
17        }
18    }
19    return -1;
20}
21
22int main() {
23    std::vector<int> nums = {0, 4, 3, 0, 4};
24    std::cout << specialArray(nums) << std::endl;
25    return 0;
26}

1