maximum-depth-of-binary-tree solution

Author: RiaOh

maximum-depth-of-binary-tree/RiaOh.js

@@ -0,0 +1,22 @@
+/**
+ * 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;
+  } else {
+    const leftDepth = maxDepth(root.left);
+    const rightDepth = maxDepth(root.right);
+
+    return Math.max(leftDepth, rightDepth) + 1;
+  }
+};