Question: Given an array of n integers numbers (with possible duplicates) in range [1..k]. Implement in Java an algorithm that preprocesses the input array in O(n+k)

Given an array of n integers numbers (with possible duplicates) in range [1..k]. Implement in Java an algorithm that preprocesses the input array in O(n+k) running time and then returns how many integer numbers there are in the range [left..right] in O(1) running time for any given left and right, 1 left right k.

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