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#include <iostream> #include <cmath> #include <vector> #include <queue> #include <algorithm> #include <cstring> #include <fstream> using namespace std; int main() { int n; cin >> n; vector<long long> sum_left(19, 0), sum_right(19, 0); for(int i = 1; i <= n; i++) { int broj; cin >> broj; int p = n / 2; int t = 0; while(p >= 1) { if(i <= p) { sum_left[t] += broj; } else { sum_right[t] += broj; } t++; p /= 2; } } long long sum = 0; for(int i = 0; i < log2(n); i++) { sum_right[i] -= sum; sum += sum_right[i]; } long long result = 0; for(int i = 0; i < log2(n); i++) { result += sum_left[i] - sum_right[i]; } cout << result << endl; return 0; }
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