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Grokking the Coding Interview Patterns

Linked List Cycle

Explore how to detect cycles within linked lists by applying the fast and slow pointer technique. This lesson helps you understand the problem, implement a solution in a hands-on coding environment, and prepare for coding interview questions involving linked list cycles.

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Statement

Given the head of a linked list, determine whether the list contains a cycle. A cycle exists if a node in the list can be revisited by continuously following the next pointers. Return TRUE if a cycle is present; otherwise, return FALSE.

Constraints:

Let n be the number of nodes in a linked list.

  • 0≤0\leq
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