![Details [Coding] Contains Duplicate (HashSet O(1) Lookup) — Java DSA Prep Guide](https://i.ytimg.com/vi/NuMHkgQQkaI/mqdefault.jpg)
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Last Updated: October 19, 2026
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In this video, we will solve LeetCode 217 – Super helpful resources: nikoo28.github.io/all-my-links/ It is very important to learn about the utility functions and data ... In this video, we solve Leetcode 217: Video contents: 00:00 - Read and understand the question 00:50 - Explain the brute force approach 02:21 - Explain the Spotted a duplicate at the party door? That is the whole problem. LeetCode 217,
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