func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     int n;     vector<int> pl;     vector<int> sum;     int a;     int otv = 0;     cin >> n;     int m = pow(2, n + 1) - 2;     pl.push_back(0);     for (int i = 1; i <= m; ++i) {       cin >> a;       pl.push_back(a);     }     for (int j = n; j > 0; j--)       for (int i = pow(2, j); i < pow(2, j + 1) - 1; i += 2) {         pl[i / 2 - 1] += max(pl[i - 1], pl[i]);         otv += abs(pl[i - 1] - pl[i]);       }     cout << otv;     return 0;   }   