func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = (int)1e9;   const long long llinf = (long long)3e18;   const int N = (int)1e5 + 111;   const long double PI = (long double)acos(-1);   int main() {     int n, cur, num, ans = 0;     scanf( %d , &n);     vector<int> a(n);     vector<char> us(n, 0);     for (int i = 0; i < n; i++) scanf( %d , &a[i]);     sort(a.begin(), a.end());     for (int i = 0; i < n; i++)       if (us[i] == 0) {         cur = i;         num = 0;         while (cur < n) {           if (us[cur] == 1 || a[cur] < num)             cur++;           else {             num++;             us[cur] = 1;           }         }         ans++;       }     printf( %d , ans);     return 0;   }   