func_code_string: #include <bits/stdc++.h>   using namespace std;   int arr[104];   int main() {     int n, avg, mn, flag;     cin >> n;     for (int i = 0; i < n; i++) {       cin >> arr[i];     }     avg = 0;     avg = arr[1] - arr[0];     flag = 0;     for (int i = 1; i < n; i++) {       int diff = (arr[i] - arr[i - 1]);       if (diff != avg) {         flag = 1;         break;       }     }     if (flag == 1) {       cout << arr[n - 1] << endl;     } else {       cout << arr[n - 1] + avg << endl;     }     return 0;   }   