func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m, k, i, j, a[1000000], b[1000000], x, res = 1;   int main() {     cin >> n;     for (i = 0; i < n; i++) {       cin >> a[i];     }     for (i = 0; i < n; i++) {       cin >> x;       b[x] = i;     }     while (b[a[res]] > b[a[res - 1]]) {       res++;     }     res = n - res;     cout << res;   }   