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Leetcode 398. Random Pick Index

Given an array with duplicates, implement a Solution class whose pick(target) method returns a uniformly random index i such that nums[i] == target. Must support many pick calls (array length up to 2×10^4, picks up to 10^4); common approaches are pre-indexing indices per value or using reservoir sampling for equal-probability selection.

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Late October, 2025

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Mid May, 2025

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Early March, 2025

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