PYTHON PROBLEM 251 · Advanced

Detect a linked-list cycle: Cycle to second node

Detect a tail that points back to an earlier node.

Floyd cycle · linked listFloyd cyclelinked list

PROBLEM OVERVIEW

What this Python exercise asks you to practise

This scenario tests detect a linked-list cycle. It belongs to the Core Data Structures: Stacks, Queues, Linked Lists, Heaps, and Intervals roadmap and uses the floyd cycle · linked list pattern.

Choosing structures by operations, monotonic reasoning, priority queues, and interval processing.

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SKILL TO CARRY FORWARD

Pattern relevance

This exercise strengthens floyd cycle · linked list. Be ready to explain the input, the rule, the boundary cases, and why the chosen approach is appropriate.