Time: 42 ms (86.39%), Space: 18.9 MB (68.78%) - LeetHub

0328-odd-even-linked-list/0328-odd-even-linked-list.py

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+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def oddEvenList(self, head: Optional[ListNode]) -> Optional[ListNode]:
+        oddHead = odd = ListNode(0)
+        evenHead = even = ListNode(0)
+        isOdd = True
+
+        while head:
+            if isOdd:
+                odd.next = head
+                odd = head
+            else:
+                even.next = head
+                even = head
+            head = head.next
+            isOdd = not isOdd
+
+        even.next = None
+        odd.next = evenHead.next
+
+        return oddHead.next