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Grokking the Coding Interview Patterns

Solution: Linked List Cycle IV

Explore the Floyd’s cycle detection algorithm to identify and remove any cycles in a singly linked list. Understand how to manipulate fast and slow pointers to restore the list to a linear state while preserving node order, ensuring efficient cycle removal with O(n) time and O(1) space complexity.

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Statement

Given the head of a singly linked list, implement a function to detect and remove any cycle present in the list. A cycle occurs when a node's next pointer links back to a previous node, forming a loop within the list.

The function must modify the linked list in place, ensuring it remains acyclic while preserving the original node order. If no cycle is found, return the linked list as is.

Constraints:

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