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Swap Nodes in Pairs

Explore how to swap every two adjacent nodes in a singly linked list by manipulating the nodes themselves rather than their values. Learn to implement an efficient solution with O(n) time complexity and constant space usage, helping you understand in-place linked list manipulation techniques.

Statement

Given a singly linked list, swap every two adjacent nodes of the linked list. After the swap, return the head of the linked list.

Note: Solve the problem without modifying the values in the ...