maximum-depth-of-binary-tree solution

Author: krokerdile

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

@@ -0,0 +1,30 @@
+/**
+ * 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;
+
+    let queue = [root];
+    let depth = 0;
+
+    while (queue.length > 0) {
+        let levelSize = queue.length;
+        for (let i = 0; i < levelSize; i++) {
+            const node = queue.shift();
+            if (node.left) queue.push(node.left);
+            if (node.right) queue.push(node.right);
+        }
+        depth++;
+    }
+
+    return depth;
+};