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二叉树的最大深度 ​

104. 二叉树的最大深度

递归解法 ​

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} root
 * @return {number}
 */
var maxDepth = function (root) {
    if (root === null) return 0;
    const leftDepth = maxDepth(root.left);
    const rightDepth = maxDepth(root.right);

    return Math.max(leftDepth, rightDepth) + 1
};