The minimum number of comparisons required to determine if an integer appears more than n/2 times in a sorted array of n integers is
(A)
θ(n)
(B)
θ(logn)
(C)
θ(nlogn)
(D)
θ(1)
Answer: (B)
Explanation:
whenever there exists an element which is present in the array : more than n/2 times, then definitely it will be present at the middle index position; in addition to that it will also be present at anyone of the neighbourhood indices namely i−1 and i+1
No matter how we push that stream of More than n/2 times of elements of same value around the Sorted Array, it is bound to be present at the middle index + atleast anyone of its neighbourhood once we got the element which should have occurred more that n/2 times we count its total occurences in O(logn) time.
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