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Grokking the Coding Interview Patterns in C#

Swap Nodes in Pairs

Explore the technique of swapping every two adjacent nodes in a singly linked list without modifying node values. This lesson helps you understand in-place linked list manipulation and implement an efficient solution that runs in linear time with constant space.

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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 list’s nodes. In other words, only the nodes themselves can be changed.

Constraints:

  • The number of nodes in the list is in the range [0,100
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