func_code_string: #include <bits/stdc++.h>   using namespace std;   const int M = 2e5 + 7;   int n, arr[M], d[M], b = 1, t = 0;   bool used[M];   int main() {     scanf( %d , &n);     for (int i = 1; i <= n; i++) {       scanf( %d , &arr[i]);       d[arr[i]]++;     }     for (int i = 1; i <= n; i++) {       if (d[arr[i]] > 1) {         while (n >= b && d[b]) b++;         if (arr[i] > b || used[arr[i]]) {           t++;           d[arr[i]]--;           d[b]++;           arr[i] = b;         } else           used[arr[i]] = 1;       }     }     printf( %d n , t);     for (int i = 1; i <= n; i++) {       printf( %d  , arr[i]);     }     return 0;   }   