Linked list cycle leetcode solution [leetcode 141] | linked list cycle detection

Published: 01 January 1970
on channel: codedecks

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Linked list cycle leetcode solution [leetcode 141] | linked list cycle detection

Solutions explained:
Solution1: We could use an extra data structure, i.e. a HashSet to go through this entire linked list, whenever we encounter the same node, we know there's a cycle.
Time: O(n)
Space: O(n)

Solution2: We could use the two pointer technique, fast pointer moves twice the pace that of the slow pointer, whenever the two pointers meet, we know there's a cycle.
Time: O(n)
Space: O(1)

Problem Link: https://leetcode.com/problems/linked-...

Solution Link: https://github.com/codedecks-in/LeetC...

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Quick look:
0:00 Problem Description
01:44 Brute force approach
03:12 Two Pointers Algorithm
05:20 Code

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