Howto Find the Start of a Cycle in a Linked List

· Anton Liberant · June 3, 2026, 8:51 p.m.
Floyd's Algorithm linked lists Cycle Detection data-structures
Summary
This post explains Floyd's Fast and Slow Pointer algorithm, which is used to detect cycles in linked lists and locate the starting node of the cycle efficiently in O(n) time and O(1) space.
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