jiteshrao

Untitled

Oct 11th, 2020
143
Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5.  
  6. class Node
  7. {
  8. public:
  9.     Node * child[2];
  10.     Node()
  11.     {
  12.         child[0] = NULL;
  13.         child[1] = NULL;
  14.     }
  15. };
  16.  
  17. // time complexity  = N * log2(max(A[i]))
  18.  
  19. void insert(Node * root, int x)
  20. {
  21.     for(int i = 32; i >= 0; i--)
  22.     {
  23.         int bit = ((x >> i) & 1);
  24.         if(root -> child[bit] == NULL)
  25.         {
  26.             root -> child[bit] = new Node();
  27.         }
  28.         root = root -> child[bit];
  29.     }
  30. }
  31.  
  32. //time complexity  = N * log2(max(A[i]))
  33.  
  34. int maXxor(Node * root, int y)
  35. {
  36.     int ret = 0;
  37.     for(int i = 32; i >= 0; i--)
  38.     {
  39.         int bit = ((y >> i) & 1);
  40.         if(root -> child[bit ^ 1] == NULL)
  41.         {
  42.             root = root -> child[bit];
  43.         }
  44.         else
  45.         {
  46.             ret |= (1LL << i);
  47.             root = root -> child[bit ^ 1];
  48.         }
  49.     }
  50.     return ret;
  51. }
  52.  
  53. // space complexity is nlogn;
  54.  
  55. int32_t main()
  56. {
  57.     int n;
  58.     cin >> n;
  59.     vector<int> arr(n);
  60.     Node * root = new Node();
  61.     int ans = 0;
  62.     for(int i = 0; i < n; i++)
  63.     {
  64.         cin >> arr[i];
  65.         int y = arr[i];
  66.         insert(root, arr[i]);
  67.         int temp = maXxor(root, y);
  68.         ans = max(ans, temp);
  69.     }
  70.     cout << ans << endl;
  71. }
RAW Paste Data

Adblocker detected! Please consider disabling it...

We've detected AdBlock Plus or some other adblocking software preventing Pastebin.com from fully loading.

We don't have any obnoxious sound, or popup ads, we actively block these annoying types of ads!

Please add Pastebin.com to your ad blocker whitelist or disable your adblocking software.

×