feat: maximum-depth-of-binary-tree

Author: hozzijeong

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

@@ -0,0 +1,34 @@
+/**
+ * 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
+
+    const dfs = (node, level) =>{
+        if(!node) return level;
+
+        let left = level;
+        let right = level
+
+        if(node.left){
+            left = dfs(node.left, level+1)
+        }
+
+        if(node.right){
+            right = dfs(node.right, level+1)
+        }
+
+        return Math.max(left,right);
+    }
+
+    return dfs(root,1)
+};