![Contains Duplicate - Python Solution [Leetcode 217]](https://i.ytimg.com/vi/M-ih-AbRuF8/mqdefault.jpg)
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Last Updated: September 20, 2026
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neetcode.io/ - A better way to prepare for Coding Interviews Twitter: twitter.com/neetcode1 Discord: ... Master Data Structures & Algorithms for FREE at AlgoMap.io/ Code solutions in Easy and Beginner Friendly Explanation with 3 approaches and Time and Space Complexity Analysis! ⚡ Related Resources ... If you found this helpful, my channel for even **MORE VIDEOS**! 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. New spin-off series for Data Structures and Algorithm. Let's look at [ 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.
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