func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, a, b, arr[25], ans = 0, c[3];     bool r1 = 1;     cin >> n >> a >> b;     c[0] = a, c[1] = b;     for (int i = 0; i < n; i++) {       cin >> arr[i];     }     int mid = n / 2;     if (2 * mid < n) mid++;     for (int i = 0; i < mid; i++) {       if (arr[i] == arr[n - i - 1] && arr[i] != 2) {         continue;       } else if (arr[i] == arr[n - i - 1] && arr[i] == 2) {         if (i == n - i - 1)           ans += min(a, b);         else           ans += 2 * min(a, b);       } else if (arr[i] == 2 || arr[n - i - 1] == 2) {         if (arr[i] == 2)           ans += c[arr[n - i - 1]];         else           ans += c[arr[i]];       } else         r1 = 0;     }     if (r1)       cout << ans << endl;     else       cout << -1 << endl;     return 0;   }   