func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int count = 0;     int a[(int)(pow(2.0, (double)(n + 1)) - 2)];     int x = (int)pow(2.0, (double)(n + 1)) - 2;     for (int i = 0; i < x; i++) {       cin >> a[i];     }     int y = (int)(pow(2.0, (double)(n + 1)) - pow(2.0, (double)n));     int b[y];     for (int i = 0; i < y; i++) b[i] = 0;     for (int i = 0; i < y; i++) {       for (int j = 0; j < n; j = j + 1)         b[i] = b[i] +                a[(int)((pow(2.0, (double)n) + i) / (pow(2.0, (double)j))) - 2];     }     for (int j = 1; j <= n; j++)       for (int i = y - 1; i >= 0; i = i - (int)pow(2.0, (double)j)) {         count = count + abs(b[i] - b[i - (int)pow(2.0, (double)(j - 1))]);         if (b[i] > b[i - (int)pow(2.0, (double)(j - 1))])           b[i - (int)pow(2.0, (double)(j - 1))] = b[i];         else           b[i] = b[i - (int)pow(2.0, (double)(j - 1))];       }     cout << count << endl;   }   