Describe an EREW PRAM algorithm to find an item in an array of length n in O(log n) time. If the item appears more than once in the array, then the algorithm should return the lowest index of the location

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Q: EREW PRAM algorithm to find an item in an array of length n in O(log n) time

A: Step 1 Below discussed:

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A: the answer is given below:-

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Counting sort

The counting sort algorithm sorts an array’s contents by counting the repetition of each element that occurs in the array. A counting sort algorithm is a stable algorithm that works the best when the range of elements in the array is small, say for example from 0 to 9. The count which is the number of repetitions of an element in the array is mapped to an index of an auxiliary array, which is then saved in an auxiliary array. The counting sort algorithm has a stable time complexity of the order of O(size of array + size of auxiliary array). Let’s discuss the algorithm in detail as follows.