func_code_string: #include <bits/stdc++.h>   int n;   int x[200050];   int f[200050];   int ans = 0;   int main() {     scanf( %d , &n);     for (int i = 0; i < n; i++) scanf( %d , &x[i]);     for (int i = 0; i < n; i++) scanf( %d , &f[i]);     int k = 0, l = 0;     while (l < n) {       if (x[k] == f[l])         k++, l++;       else         ans++, l++;     }     printf( %d n , ans);   }   