Question: Describe an algorithm that, given an unsorted array of n integers in the range 0 to k, preprocesses its input and then answers any query

Describe an algorithm that, given an unsorted array of n integers in the range 0 to k, preprocesses its input and then answers any query about how many of the n integers fall into a range a to b in O(1) time. Your algorithm should use O(n + k) preprocessing time

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