#include <cstdio>
#include <cstddef>
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <utility>
using namespace std;
typedef vector<int> VI;
typedef long long LL;
#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define VAR(v, n) typeof(n) v = (n)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())
#define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define PB push_back
#define ST first
#define ND second
int pow2[] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 
			  8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576};
int main() {
	ios_base::sync_with_stdio(false);
	int n;
	unsigned long long t;
	cin >> n >> t;
	unsigned long long a[pow2[n]];
	REP(i, pow2[n]) cin >> a[i];
	if(t % 2 == 0)
		REP(i, pow2[n]) cout << a[i] << " ";
	else
		FORD(i, pow2[n] - 1, 0) cout << a[i] << " ";
	return 0;
}
        | 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 30 31 32 33 34 35 36 37 38 39 40 41 42 | #include <cstdio> #include <cstddef> #include <iostream> #include <algorithm> #include <string> #include <vector> #include <utility> using namespace std; typedef vector<int> VI; typedef long long LL; #define FOR(x, b, e) for(int x = b; x <= (e); ++x) #define FORD(x, b, e) for(int x = b; x >= (e); --x) #define REP(x, n) for(int x = 0; x < (n); ++x) #define VAR(v, n) typeof(n) v = (n) #define ALL(c) (c).begin(), (c).end() #define SIZE(x) ((int)(x).size()) #define FOREACH(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i) #define PB push_back #define ST first #define ND second int pow2[] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576}; int main() { ios_base::sync_with_stdio(false); int n; unsigned long long t; cin >> n >> t; unsigned long long a[pow2[n]]; REP(i, pow2[n]) cin >> a[i]; if(t % 2 == 0) REP(i, pow2[n]) cout << a[i] << " "; else FORD(i, pow2[n] - 1, 0) cout << a[i] << " "; return 0; } | 
 
            
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