Package g0001_0100.s0024_swap_nodes_in_pairs

Class Solution

java.lang.Object

g0001_0100.s0024_swap_nodes_in_pairs.Solution

public class Solution
extends Object

24 - Swap Nodes in Pairs.<p>Medium</p> <p>Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list&rsquo;s nodes (i.e., only nodes themselves may be changed.)</p> <p><strong>Example 1:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2020/10/03/swap_ex1.jpg" alt="" /></p> <p><strong>Input:</strong> head = [1,2,3,4]</p> <p><strong>Output:</strong> [2,1,4,3]</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> head = []</p> <p><strong>Output:</strong> []</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> head = [1]</p> <p><strong>Output:</strong> [1]</p> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in the list is in the range <code>[0, 100]</code>.</li> <li><code>0 <= Node.val <= 100</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
ListNode	swapPairs(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

swapPairs

public ListNode swapPairs(ListNode head)