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Given a list of tuples that represent (X, Y) coordinates on an XY plane and an integer K, return a list of the K-closest points to the origin (0, 0).
Given an array of integers, return an array of triplets such that i != j != k and nums[i] + nums[j] + nums[k] = 0.
Given an array of integers, return the indices of the two numbers that add up to a given target.
Design and implement an efficient sampler that works in average O(1) time complexity.
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