1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
#include <cstdio>
#define MAXN (2<<20)

int A[MAXN];

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