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Count BST nodes that lie in a given range
Submissions: 31748   Accuracy:

50.5%

  Difficulty: Medium   Marks: 4
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Given a Binary Search Tree (BST) and a range l-h(inclusive), count the number of nodes in the BST that lie in the given range.

  • The values smaller than root go to the left side
  • The values greater and equal to the root go to the right side

Example 1:

Input:
      10
     /  \
    5    50
   /    /  \
  1    40  100
l = 5, h = 45
Output: 3
Explanation: 5 10 40 are the node in the
range

Example 2:

Input:
     5
    /  \
   4    6
  /      \
 3        7
l = 2, h = 8
Output: 5
Explanation: All the nodes are in the
given range.

Your Task:
This is a function problem. You don't have to take input. You are required to complete the function getCountOfNode() that takes root, l ,h as parameters and returns the count.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(Height of the BST).

Constraints:
1 <= Number of nodes <= 100
1 <= l < h < 103

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Amit Khandelwal
Author: Shubham Joshi 1
Editorial


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