func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[202020], f[202020];   int s[202020];   bool br[202020];   int n, doe, ans;   int main() {     scanf( %d , &n);     for (int i = 1; i <= n; ++i) scanf( %d , &a[i]), ++f[a[i]];     doe = 1;     while (f[doe] != 0) ++doe;     for (int i = 1; i <= n; ++i) {       if (f[a[i]] == 1 && br[a[i]] == 0) {         s[i] = a[i];         br[a[i]] = 1;         continue;       }       if (a[i] < doe && br[a[i]] == 0) {         s[i] = a[i];         br[a[i]] = 1;         --f[a[i]];         continue;       }       ++ans;       s[i] = doe;       --f[a[i]];       br[doe] = 1;       ++doe;       while (f[doe] != 0) ++doe;     }     printf( %d n , ans);     printf( %d , s[1]);     for (int i = 2; i <= n; ++i) printf(  %d , s[i]);     printf(  n );     return 0;   }   