1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
#include <iostream>

using namespace std;

int main() {
  ios_base::sync_with_stdio(0);
  int n, t, a[1<<20];
  cin >> n >> t;
  int k = 1 << n;
  for (int i = 0; i < k; i++) {
    cin >> a[i];
  }

  if (t % 2 == 1) {
    for (int i = k - 1; i >= 0; --i) {
      cout << a[i] << " ";
    }
  }
  else {
    for (int i = 0; i < k; i++) {
      cout << a[i] << " ";
    }
  }

  return 0;
}