merge-two-sorted-lists

Author: sooooo-an

merge-two-sorted-lists/sooooo-an.ts

@@ -0,0 +1,22 @@
+function mergeTwoLists(
+  list1: ListNode | null,
+  list2: ListNode | null
+): ListNode | null {
+  const result = new ListNode();
+  let tail = result;
+
+  while (list1 !== null && list2 !== null) {
+    if (list1.val <= list2.val) {
+      tail.next = list1;
+      list1 = list1.next;
+    } else {
+      tail.next = list2;
+      list2 = list2.next;
+    }
+    tail = tail.next;
+  }
+
+  tail.next = list1 !== null ? list1 : list2;
+
+  return result.next;
+}