#include <bits/stdc++.h>
using namespace std;
const int N = 1048600;
int n, t, a[N];
int main() {
    scanf("%d %d", &n, &t);
    n = 1 << n;
    for(int i = 1; i <= n; ++i)
        scanf("%d", &a[i]);
    if((bool)(t & 1))
        for(int i = n; i > 0; --i)
            printf("%d ", a[i]);
    else
        for(int i = 1; i <= n; ++i)
            printf("%d ", a[i]);
    return 0;
}
        | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #include <bits/stdc++.h> using namespace std; const int N = 1048600; int n, t, a[N]; int main() { scanf("%d %d", &n, &t); n = 1 << n; for(int i = 1; i <= n; ++i) scanf("%d", &a[i]); if((bool)(t & 1)) for(int i = n; i > 0; --i) printf("%d ", a[i]); else for(int i = 1; i <= n; ++i) printf("%d ", a[i]); return 0; } | 
 
            
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