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Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present. remove(val): Removes an item val from the ...

Two SumCategory Difficulty Likes Dislikesalgorithms Easy (43.81%) 10587 350TagsCompaniesGiven an array of integers, return indices of the two numbers such that they add up to a specific target.Y...

Add Two NumbersCategory Difficulty Likes Dislikesalgorithms Medium (31.66%) 5950 1551TagsCompaniesYou are given two non-empty linked lists representing two non-negative integers. The digits are s...