Web Reference: Each element must have the same probability of being returned. You must implement the functions of the class such that each function works in average O (1) time complexity. In-depth solution and explanation for LeetCode 380. Insert Delete GetRandom O (1) in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. A common initial approach is to use only a hash map, which provides O (1) insert and delete but O (n) for getRandom() since hash maps do not support random index access.
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  1. Insert Delete Getrandom O 1 - Latest Information & Updates 2026 Information & Biography
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Insert Delete Getrandom O 1 - Latest Information & Updates 2026 Information & Biography

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Last Updated: April 3, 2026

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