617-merge-two-binary-trees

DevGod

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Caution

DevGod needs to write an editorial for this problem!

js

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {TreeNode} root1
 * @param {TreeNode} root2
 * @return {TreeNode}
 */
var mergeTrees = function(root1, root2) {
    if(!root1 && !root2){ return null; }

    let newNode = new TreeNode( (root1?.val|0) + (root2?.val|0) );

    newNode.left = mergeTrees(root1?.left, root2?.left);
    newNode.right = mergeTrees(root1?.right, root2?.right);

    return newNode;
};