Participate in Codex, Test Your Skills & Win BIG

Recover Binary Search Tree


Two elements of a binary search tree (BST) are swapped by mistake.
Tell us the 2 values swapping which the tree will be restored.

Note:
A solution using O(n) space is pretty straight forward. Could you devise a constant space solution?

Example :


Input : 
         1
        / \
       2   3

Output : 
       [1, 2]

Explanation : Swapping 1 and 2 will change the BST to be 
         2
        / \
       1   3
which is a valid BST          
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
Start solving Recover Binary Search Tree on Interview Code Editor
Hints
  • Hint 1
  • Solution Approach
  • Complete Solution
Asked In:

Discussion


Loading...
Click here to start solving coding interview questions