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4 questions

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CodingMediumLeetCode 380
Insert Delete GetRandom O(1)
Design a data structure supporting insert(val), remove(val), and getRandom() — which returns a uniformly random existing element — with each operation in average O(1) time…
Companies: Amazon, Apple, Bloomberg, Citadel +7
Array · Design · Hash Table · Math
Last reported Sep 2026
Open workspace
CodingHardLeetCode 381
Insert Delete GetRandom O(1) - Duplicates allowed
Design a data structure for a multiset that supports insert(val) (adding even duplicate occurrences), remove(val) (removing a single occurrence), and getRandom() (returning an…
Companies: CrowdStrike, LinkedIn, Okta
Array · Design · Hash Table · Math
Last reported Sep 2026
Open workspace
CodingMediumLeetCode 528
Random Pick with Weight

Given an array of positive weights, implement pickIndex() to return index i with probability w[i]/sum(w); the typical approach preprocessing prefix sums and using a random…

Companies: Amazon, Apple, Goldman Sachs, Meta +4

Array · Binary Search · Math · Prefix Sum

Last reported Jun 2026

CodingMediumLeetCode 384

Shuffle an Array

Design a class that stores an integer array and supports reset (returning the original configuration) and shuffle (returning a uniformly random permutation so that all…

Companies: Microsoft, Uber

Array · Design · Math · Randomized

Last reported Feb 2026