Skip to main content

Odd Even Linked List

Question​

None

Example 1
Input: 1->2->3->4->5->NULL

Output: 1->3->5->2->4->NULL

Solution​

all//Odd Even Linked List.py


# 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):
        if head is None:
            return head
        odd = head
        even = head.next
        evenhead = even
        while even and even.next:
            odd.next = odd.next.next
            even.next = even.next.next
            odd = odd.next
            even = even.next
        odd.next = evenhead
        return head