func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, number;     cin >> n;     int arr[n + 1];     bool marcado[n + 1];     memset(marcado, 0, sizeof marcado);     for (int i = 1; i <= n; i++) {       cin >> number;       if (!marcado[number] && number <= n) {         marcado[number] = true;         arr[i] = number;       } else         arr[i] = 0;     }     int i, j;     for (i = 1, j = 1; i <= n; i++) {       if (arr[i] != 0) {         cout << arr[i] <<    ;       } else {         while (marcado[j]) j++;         cout << j++ <<    ;       }     }   }   