#include<bits/stdc++.h>
using namespace std;
#define int long long
void swp(int* bg, int *mid, int *end) {
  while(mid != end) {
    swap(*bg, *mid);
    bg++;mid++;
  }
}
void shuffle(int*bg, int *end) {
  if (bg + 1 == end) return;
  int* mid = bg+(end-bg)/2;
  shuffle(bg, mid);
  shuffle(mid, end);
  swp(bg, mid, end);
}
int a[1<<21];
main() {
  int n, t;
  scanf("%lld %lld", &n, &t);
  int pot = (1<<n);
  for (int i = 0; i <pot;i++)
    scanf("%lld", a+i);
  if (t%2) shuffle(a, a+pot);
  for (int i = 0; i <pot;i++)
    printf("%lld ", a[i]);
  printf("\n");
}
        | 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 27 28 29 | #include<bits/stdc++.h> using namespace std; #define int long long void swp(int* bg, int *mid, int *end) { while(mid != end) { swap(*bg, *mid); bg++;mid++; } } void shuffle(int*bg, int *end) { if (bg + 1 == end) return; int* mid = bg+(end-bg)/2; shuffle(bg, mid); shuffle(mid, end); swp(bg, mid, end); } int a[1<<21]; main() { int n, t; scanf("%lld %lld", &n, &t); int pot = (1<<n); for (int i = 0; i <pot;i++) scanf("%lld", a+i); if (t%2) shuffle(a, a+pot); for (int i = 0; i <pot;i++) printf("%lld ", a[i]); printf("\n"); } | 
 
            
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