find-correspoding-node-in-clone.js

/*
Given two binary trees original and cloned and given a reference to a node target in the original tree.

The cloned tree is a copy of the original tree.

Return a reference to the same node in the cloned tree.

Note that you are not allowed to change any of the two trees or the target node and the answer must be a reference to a node in the cloned tree.

 

Example 1:


Input: tree = [7,4,3,null,null,6,19], target = 3
Output: 3
Explanation: In all examples the original and cloned trees are shown. The target node is a green node from the original tree. The answer is the yellow node from the cloned tree.
Example 2:


Input: tree = [7], target =  7
Output: 7
Example 3:


Input: tree = [8,null,6,null,5,null,4,null,3,null,2,null,1], target = 4
Output: 4
*/


var getTargetCopy = function(original, cloned, target) {

    if(!original || !cloned) return null;

    if(cloned.val === target.val) return cloned;

    const leftVal = getTargetCopy(original.left, cloned.left, target);
    if(leftVal) return leftVal;

    const rightVal = getTargetCopy(original.right, cloned.right, target);
    if(rightVal) return rightVal;

};

/*
Here we are indidually checking left and right val
if it doest exist return null
if its equal we return that cloned tree
so we are storing that cloned part if it matches the target
so return it if it exists
*/