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LeetCode 141: Tortoise vs. Hare — The Pointer Duel Every Coder Fakes

2.5 million LeetCode solutions to problem 141. Most coders chase the answer without grasping the loop. Time to outrun the herd.

theAIcatchup Apr 09, 2026 4 min read
Animated trace of tortoise and hare pointers colliding in a linked list cycle

⚡ Key Takeaways

  • Floyd's tortoise-hare nails cycle detection in O(n) time, O(1) space 𝕏
  • Visual tracers like TraceLit make abstract pointers tangible — interview edge 𝕏
  • Master edges: nulls, short lists, cycles anywhere — or fake it poorly 𝕏
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theAIcatchup

Community-driven. Code-first.

#Floyd's algorithm #LeetCode 141 #linked list cycle #tortoise and hare #tortoise hare #two pointers

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Originally reported by Dev.to

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