![Contains Duplicate - Python Solution [Leetcode 217]](https://i.ytimg.com/vi/M-ih-AbRuF8/mqdefault.jpg)
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Last Updated: September 27, 2026
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neetcode.io/ - A better way to prepare for Coding Interviews Twitter: twitter.com/neetcode1 Discord: ... Easy and Beginner Friendly Explanation with 3 approaches and Time and Space Complexity Analysis! ⚡ Related Resources ... Master Data Structures & Algorithms for FREE at AlgoMap.io/ Code solutions in Join this channel to get access to perks: youtube.com/channel/UCGPoHTVjMN77wcGknXPHl1Q/join ... Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Most teachers introduce solutions as fully-formed recipes. But in doing so, they totally miss how solutions are DISCOVERED.
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