func_code_string: #include <bits/stdc++.h>   using namespace std;   #pragma comment(linker,  /STACK:400000000 )   int n, a[200010], b[200010], f[200010];   int main() {     cin >> n;     for (int i = 0; i < n; i++) cin >> a[i];     for (int i = 0; i < n; i++) {       int x;       cin >> x;       f[x - 1] = i;     }     for (int i = 0; i < n; i++) b[i] = f[a[i] - 1];     for (int i = 1; i < n; i++) {       if (b[i] < b[i - 1]) {         cout << n - i;         return 0;       }     }     cout << 0;   }   