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Grokking the Coding Interview Patterns in Python

Swap Nodes in Pairs

Explore how to swap nodes pairwise in a singly linked list by manipulating pointers instead of values. This lesson helps you understand in-place linked list operations that run efficiently in linear time and constant space, enhancing your ability to solve common linked list interview problems.

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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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