func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, a[200100], b[200100];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     cin >> n;     for (int i = 1; i <= n; i++) cin >> a[i];     for (int i = 1; i <= n; i++) {       int x;       cin >> x;       b[x] = i;     }     int mx = 0;     for (int i = 1; i <= n; i++) {       a[i] = b[a[i]];       if (a[i - 1] < a[i])         mx++;       else         break;     }     cout << n - mx;   }   