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Solution: Linked List Cycle—Hashing

Explore how to detect cycles in a linked list by using a hash set to track visited nodes. Understand the algorithm and its implementation in Python, along with the time and space complexities involved in solving this common coding interview problem.

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Statement

Given the head of a linked list, check whether or not a cycle is present in the linked list. A cycle is present in a linked list if at least one node can be reached again by traversing the next pointer. If a cycle exists, return TRUE, otherwise return FALSE.

Constraints:

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

  • 00 \leq n 500\leq 500 ...