#include <cstdio>
const int MAX_N = (1<<20)+9;
int a[MAX_N];
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&1) {
        printf("%d", a[n-1]);
        for (int i = n-2; i >= 0; --i)
            printf(" %d", a[i]);
    } else {
        printf("%d", a[0]);
        for (int i = 1; i < n; ++i)
            printf(" %d", 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 | #include <cstdio> const int MAX_N = (1<<20)+9; int a[MAX_N]; 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&1) { printf("%d", a[n-1]); for (int i = n-2; i >= 0; --i) printf(" %d", a[i]); } else { printf("%d", a[0]); for (int i = 1; i < n; ++i) printf(" %d", a[i]); } printf("\n"); } | 
 
            
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