[freemjstudio] WEEK 04 Solutions

merge-two-sorted-lists/freemjstudio.py

@@ -0,0 +1,24 @@
+# Definition for singly-linked list.
+# 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]:
+        dummy = ListNode()
+        merged_list = dummy
+
+        while list1 is not None and list2 is not None:
+            if list1.val <= list2.val:
+                merged_list.next = list1
+                list1 = list1.next
+            else:
+                merged_list.next = list2
+                list2 = list2.next
+            # merged_list 포인터를 한칸 이동시켜서 다음 노드 붙일 준비
+            merged_list = merged_list.next
+
+        # 남아 있는 노드 붙이기
+        merged_list.next = list1 if list1 is not None else list2
+
+        return dummy.next