add: maximumDepthOfBinary solution

Author: Cyjin-jani

maximum-depth-of-binary-tree/Cyjin-jani.js

@@ -0,0 +1,28 @@
+/**
+ * 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) return 0;
+  let answer = 0;
+
+  function dfs(node, count) {
+    answer = Math.max(answer, count);
+
+    if (!node.left && !node.right) return;
+
+    if (node.left) dfs(node.left, count + 1);
+    if (node.right) dfs(node.right, count + 1);
+  }
+  dfs(root, 1);
+
+  return answer;
+};