1379.find-a-corresponding-node-of-a-binary-tree-in-a-clone-of-that-tree.java

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */

class Solution {
    public final TreeNode getTargetCopy(final TreeNode original, final TreeNode cloned, final TreeNode target) {
        if(cloned == null)
            return cloned;
        
        if(cloned.val == target.val)
            return cloned;
        
        TreeNode lft = getTargetCopy(original, cloned.left, target);
        if(lft == null)
            return getTargetCopy(original, cloned.right, target);
        
        return lft;
        
    }
}