Week 4: merge-two-sorted-lists solution

Author: mandel-17

merge-two-sorted-lists/mandel-17.py

@@ -0,0 +1,16 @@
+from typing import Optional
+
+class ListNode:
+    def __init__(self, val=0, next=None):
+        self.val = val
+        self.next = next
+
+class Solution:
+    def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]:
+        if (not list1) or (list2 and list1.val > list2.val):
+            list1, list2 = list2, list1
+        if list1:
+            list1.next = self.mergeTwoLists(list1.next, list2)
+        
+        return list1
+