Question: Given an unsorted array A of size n that may contain duplicates and a number k < n, design an O(n) algorithm that returns true

Given an unsorted array A of size n that may contain duplicates and a number k < n, design an O(n) algorithm that returns true if array contains duplicates within a distance of k, ie. i, j [0, n 1] such that A[i] = A[j] and |i j| < k.

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