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Grokking the Coding Interview Patterns

Swap Nodes in Pairs

Explore how to swap every two adjacent nodes in a singly linked list using in-place manipulation techniques. Learn to solve this problem efficiently in O(n) time and O(1) space without changing node values. This lesson helps you understand linked list node reordering for coding interviews.

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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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