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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5.  
  6. int countBinarySearchableIndex(int Arr[], int l, int r,
  7.  
  8.                                int LR, int RL)
  9. {
  10.  
  11.     if(l > r) 
  12.     return 0;
  13.  
  14.     int ans = 0; 
  15.  
  16.     int mid = (l + r) /2 ; 
  17.  
  18.     if(Arr[mid] > LR && Arr[mid] < RL)
  19.     ans = 1; 
  20.  
  21.  
  22.     int left = countBinarySearchableIndex(Arr, 0, mid-1, LR, min(RL, Arr[mid]));
  23.     int ri = countBinarySearchableIndex(Arr, mid+1, r,  max(LR,Arr[mid]),  RL);
  24.  
  25.     return ans + left + ri;
  26. }
  27.  
  28.  
  29.  
  30.  
  31. int main()
  32. {
  33.  
  34.     int Arr[] = { 10, 1,  2, 3, 4,  8,  6, 5,
  35.  
  36.                   7,  12, 9, 8, 13, 15, 11 };
  37.  
  38.     int n = 15;
  39.  
  40.     cout << "Number of Binary Searchable Indexes: ";
  41.  
  42.     cout << countBinarySearchableIndex(Arr, 0, n - 1, -1e9,
  43.  
  44.                                        1e9)
  45.  
  46.          << endl;
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0.01s 5284KB
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Standard input is empty
stdout
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Number of Binary Searchable Indexes: 9
https://ideone.com/M04UZe
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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