func_code_string: #include <bits/stdc++.h>   using namespace std;   const int Maxn = 200 * 1000 + 10;   int n, arr[Maxn], ind[Maxn], ans;   int main() {     cin >> n;     for (int i = 0; i < n; i++) scanf( %d , &arr[i]);     int a;     for (int i = 0; i < n; i++) {       scanf( %d , &a);       ind[a] = i;     }     int prev = 0;     for (int i = 0; i < n; i++) {       if (ind[arr[i]] < prev) {         cout << n - i << endl;         return 0;       }       prev = ind[arr[i]];     }     cout << 0 << endl;     return 0;   }   