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Detect Cycle in Linked List — Floyd's Algorithm Explained (LeetCode 141) #lindorcodes #leetcode
HashMap gets you O(n) space. The two-pointer approach gets you O(1). In this video, I walk through both — brute force first so you actually understand why we move to Floyd's, then the full tortoise-and-hare solution with every edge case broken down before we touch code. The tricky part isn't the algorithm itself, it's handling the linked list ...
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