Web Reference: In-depth solution and explanation for LeetCode 217. Contains Duplicate in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. If duplicates exist, the set will contain fewer elements. The logic is identical to the earlier approach — this version is just a shorter and more concise implementation of it. Contains Duplicate - 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. Example 1: Input: nums = [1,2,3,1] Output: true Explanation: The element 1 occurs at the indices 0 and 3.
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Contains Duplicate Leetcode 217 Python3 Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
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Last Updated: April 8, 2026
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