Trim A Binary Search Tree is an example of tree problems. In this post we will see how we can solve in Javascript.

Problem Description

Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies in [L, R] (R >= L).

You might need to change the root of the tree, so the result should return the new root of the trimmed binary search tree.

 
  Example 1:
  Input:
      1
     / \
    0   2
 
    L = 1
    R = 2
 
  Output:
      1
        \
         2
  Example 2:
  Input:
      3
     / \
    0   4
     \
      2
     /
    1
 
    L = 1
    R = 3
 
  Output:
        3
       /
     2
    /
   1

Please check the main.js snippet for the solution.

If you have different approach in mind or have any suggestion for this implementation feel free to share in the comment below. Thanks!