1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
#include <iostream>
#include <algorithm>
using namespace std;

int main()
{
    ios_base::sync_with_stdio( false );
    cin.tie( nullptr );
    int n, t;
    cin >> n >> t;
    n = (1<<n);
    int *a = new int[n];
    for( int i = 0; i < n; ++i )
        cin >> a[i];
    if( t % 2 )
        reverse( a, a+n );
    for( int i = 0; i < n; ++i )
        cout << a[i] << " ";
    return 0;
}