1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
#include <cstdio>
#include <vector>

const int max_n = 1 << 20;

int n, t;
int T[max_n];

int main() {
  scanf("%d %d", &n, &t);
  n = 1<<n;
  for (int i = 0; i < n; ++i) {
    scanf("%d", T + i);
  }
  if (t % 2) {
    for (int i = n - 1; i >= 0; --i) printf("%d ", T[i]);
  } else {
    for (int i = 0; i < n; ++i) printf ("%d ", T[i]);
  }
  return 0;
}