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24. Swap Nodes in Pairs

Given a linked list, swap every two adjacent nodes and return its head.

You may not modify the values in the list's nodes, only nodes itself may be changed.

 

Example:

Given 1->2->3->4, you should return the list as 2->1->4->3.

Difficulty:

Medium

Lock:

Normal

Company:

Amazon Apple Bloomberg eBay Facebook Google Lyft Microsoft Oracle SAP Uber