Merge pull request #1363 from RiaOh/main

[RiaOh] WEEK 04 solutions

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;
+  }
+};

merge-two-sorted-lists/RiaOh.js

@@ -0,0 +1,34 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} list1
+ * @param {ListNode} list2
+ * @return {ListNode}
+ */
+var mergeTwoLists = function (list1, list2) {
+  const node = new ListNode();
+  let tail = node;
+
+  while (list1 && list2) {
+    if (list1.val < list2.val) {
+      tail.next = list1;
+      list1 = list1.next;
+    } else {
+      tail.next = list2;
+      list2 = list2.next;
+    }
+    tail = tail.next;
+  }
+
+  if (list2) {
+    tail.next = list2;
+  } else if (list1) {
+    tail.next = list1;
+  }
+  return node.next;
+};