func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200009;   int a[N], pos[N];   int main() {     int n;     cin >> n;     for (int i = 1; i <= n; i++) cin >> a[i];     for (int i = 1; i <= n; i++) {       int x;       cin >> x;       pos[x] = i;     }     for (int i = 1; i <= n; i++) a[i] = pos[a[i]];     int ans = 0;     for (int i = 2; i <= n; i++) {       if (a[i] < a[i - 1]) {         i--;         cout << n - i << endl;         return 0;       }     }     cout << 0 << endl;   }   