easyBlind 75
Linked List Cycle
Return True if the linked list has a cycle, otherwise False. Example: [3,2,0,-4] with tail -> index 1 => True
Linked List Cycle is where Floyd's tortoise and hare earns its keep: two pointers, one moving twice as fast, must meet inside any loop. The hash-set answer works but spends O(n) memory you do not need. Get the fast-and-slow rhythm here and cycle-entry and middle-of-list fall out for free.
Linked ListTwo Pointers
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1Linked List Cycle (Floyd's)easy
Based onLeetCode