![Contains Duplicate - Python Solution [Leetcode 217]](https://i.ytimg.com/vi/M-ih-AbRuF8/mqdefault.jpg)
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Last Updated: September 29, 2026
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neetcode.io/ - A better way to prepare for Coding Master Data Structures & Algorithms for FREE at AlgoMap.io/ Code solutions in Easy and Beginner Friendly Explanation with 3 Join this channel to get access to perks: youtube.com/channel/UCGPoHTVjMN77wcGknXPHl1Q/join ... Most teachers introduce solutions as fully-formed recipes. But in doing so, they totally miss how solutions are DISCOVERED. This question is from the Blind 75 series, The solution explained is of O(n) Time Complexity and uses O(n) space complexity.
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