g0301_0400.s0328_odd_even_linked_list

Class Solution

java.lang.Object

g0301_0400.s0328_odd_even_linked_list.Solution

public class Solution
extends Object

328 - Odd Even Linked List.

Medium

Given the head of a singly linked list, group all the nodes with odd indices together followed by the nodes with even indices, and return the reordered list.

The first node is considered odd, and the second node is even, and so on.

Note that the relative order inside both the even and odd groups should remain as it was in the input.

You must solve the problem in O(1) extra space complexity and O(n) time complexity.

Example 1:

Input: head = [1,2,3,4,5]

Output: [1,3,5,2,4]

Example 2:

Input: head = [2,1,3,5,6,4,7]

Output: [2,3,6,7,1,5,4]

Constraints:

• n ==number of nodes in the linked list
• 0 <= n <= 104
• -106 <= Node.val <= 106

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
ListNode	oddEvenList(ListNode head)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

oddEvenList

public ListNode oddEvenList(ListNode head)