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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. // Speed
  5. #define fast_io ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
  6.  
  7. // Typedefs
  8. #define int long long
  9. #define pb push_back
  10. #define ff first
  11. #define ss second
  12. #define all(x) (x).begin(), (x).end()
  13. #define rall(x) (x).rbegin(), (x).rend()
  14. #define sz(x) ((int)(x).size())
  15. #define endl '\n'
  16. #define yes cout << "yes\n"
  17. #define no cout << "no\n"
  18.  
  19. // Loops
  20. #define rep(i,a,b) for(int i=a;i<b;++i)
  21. #define per(i,a,b) for(int i=b-1;i>=a;--i)
  22. #define each(x, a) for (auto& x : a)
  23.  
  24. // Consts
  25. const int INF = 1e18;
  26. const int MOD = 1e9+7;
  27. const int N = 2e5 + 5;
  28.  
  29. // Math
  30. int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); }
  31. int lcm(int a, int b) { return (a / gcd(a, b)) * b; }
  32.  
  33. int power(int a, int b, int m = MOD) {
  34.     int res = 1;
  35.     while (b > 0) {
  36.         if (b & 1) res = res * a % m;
  37.         a = a * a % m;
  38.         b >>= 1;
  39.     }
  40.     return res;
  41. }
  42.  
  43. int modinv(int a, int m = MOD) {
  44.     return power(a, m - 2, m);
  45. }
  46.  
  47. // Logic
  48. void solve() {
  49.     int n;
  50.     cin >> n;
  51.     int N = 1 << n;
  52.  
  53.     vector<vector<int>> bucket(n);
  54.     for (int x = 1; x < N; x++) {
  55.         int msb = 31 - __builtin_clz(x);
  56.         bucket[msb].push_back(x);
  57.     }
  58.  
  59.     for (int i = 0; i < n; i++)
  60.         sort(bucket[i].begin(), bucket[i].end());
  61.  
  62.     for (int i = n - 1; i >= 0; i--) {
  63.         for (int x : bucket[i]) {
  64.             cout << x << " ";
  65.         }
  66.     }
  67.  
  68.     cout << 0 << '\n';
  69. }
  70.  
  71. // Main
  72. int32_t main() {
  73.     fast_io;
  74.  
  75.     int t;
  76.     cin >> t;
  77.     while (t--) {
  78.         solve();
  79.     }
  80.  
  81.     return 0;
  82. }
  83.  
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
2
1
2
stdout 
1 0
2 3 1 0
https://ideone.com/S1Savh
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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