g1701_1800.s1721_swapping_nodes_in_a_linked_list

Class Solution

java.lang.Object

g1701_1800.s1721_swapping_nodes_in_a_linked_list.Solution

public class Solution
extends Object

1721 - Swapping Nodes in a Linked List.

Medium

You are given the head of a linked list, and an integer k.

Return the head of the linked list after swapping the values of the kth node from the beginning and the kth node from the end (the list is 1-indexed ).

Example 1:

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

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

Example 2:

Input: head = [7,9,6,6,7,8,3,0,9,5], k = 5

Output: [7,9,6,6,8,7,3,0,9,5]

Constraints:

• The number of nodes in the list is n.
• 1 <= k <= n <= 105
• 0 <= Node.val <= 100

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
ListNode	swapNodes(ListNode head, int k)

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

swapNodes

public ListNode swapNodes(ListNode head,
                          int k)