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#include <iostream> #include <cmath> #include <vector> #include <queue> #include <algorithm> #include <cstring> #include <fstream> using namespace std; int main() { ios_base::sync_with_stdio(false); int n; cin >> n; long long L = 0, R = 0; for(int i = 1; i <= n; i++) { int x; cin >> x; int runda = n; while(runda > 1) { if(i <= (runda / 2)) { L += x; } else if(i > (runda / 2) and i <= runda){ R += x; } runda /= 2; } } cout << L - R << endl; return 0; }
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