Submission #1260472

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Source Code Expand

#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

int main()
{
    int n;
    cin >> n;
    n = 1 << n;
    vector<int> a(n);
    for(int i=0; i<n; ++i)
        cin >> a[i];

    while(n > 1){
        n /= 2;
        vector<int> b(n);
        for(int i=0; i<n; ++i){
            if(a[2*i] == a[2*i+1])
                b[i] = a[2*i];
            else
                b[i] = abs(a[2*i] - a[2*i+1]);
        }
        a.swap(b);
    }
    cout << a[0] << endl;

    return 0;
}

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