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Swap Nodes in Pairs

Explore how to swap every two adjacent nodes in a singly linked list without altering node values. Understand constraints and implement an O(n) time, O(1) space solution to efficiently manipulate linked lists in place.

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 ...