leet 328. Odd Even Linked List - 파이썬python3

 

class Solution:
    def oddEvenList(self, head: Optional[ListNode]) -> Optional[ListNode]:
        if not head:
            return None

        odd = head
        even = head.next
        even_head = head.next

        while even and even.next:
            odd.next = odd.next.next
            even.next = even.next.next
            odd = odd.next
            even = even.next

        odd.next = even_head
        return head