How to Solve Linked List Cycle Problem
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Linked List Cycle
Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously fol...
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Understanding the Linked List Cycle Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer. Internally, pos is used to denote the index of the node that tail's next pointer is connected to. Note that pos is not passed as a parameter. Return true if there is a cycle in the linked list. Otherwise, return false.
Linked List Cycle
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How Interview Coder Helps
Get real-time assistance for Linked List Cycle problems during coding interviews. Interview Coder provides instant solutions and explanations.
Examples
head = [3,2,0,-4], pos = 1trueThere is a cycle in the linked list, where the tail connects to the 1st node (0-indexed).
head = [1,2], pos = 0trueThere is a cycle in the linked list, where the tail connects to the 0th node.
head = [1], pos = -1falseThere is no cycle in the linked list.
Constraints
The number of the nodes in the list is in the range [0, 104].105 <= Node.val <= 105pos is -1 or a valid index in the linked-list.Follow up: Can you solve it using O(1) (i.e. constant) memory?How Interview Coder Helps with Leetcode Problems
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Frequently Asked Questions
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