Package g0101_0200.s0143_reorder_list

Class Solution

java.lang.Object
g0101_0200.s0143_reorder_list.Solution
public class Solution extends java.lang.Object
143 - Reorder List.

Medium

You are given the head of a singly linked-list. The list can be represented as:

L0 \u2192 L1 \u2192 \u2026 \u2192 Ln - 1 \u2192 Ln

Reorder the list to be on the following form:

L0 \u2192 Ln \u2192 L1 \u2192 Ln - 1 \u2192 L2 \u2192 Ln - 2 \u2192 \u2026

You may not modify the values in the list’s nodes. Only nodes themselves may be changed.

Example 1:

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

Output: [1,4,2,3]

Example 2:

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

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

Constraints:

  • The number of nodes in the list is in the range [1, 5 * 104].
  • 1 <= Node.val <= 1000

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    reorderList(ListNode head)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • reorderList

      public void reorderList(ListNode head)