[leet] maxDepth

Author: hyeonbinHur

허현빈/9주차/Maximum Depth of Binary Tree.js

@@ -0,0 +1,8 @@
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+var maxDepth = function (root) {
+  if (!root) return 0;
+  return 1 + Math.max(maxDepth(root.left), maxDepth(root.right));
+};