Let A be an array of n integers, where n is divisible by 4. Describe an algorithm with O(n) time complexity to decide whether there exists an element that occurs more than n/4 times in A. (a) Show that if such an element exists in A, it must be either the (n/4)-th, or the (2n/4)-th, or the (3n/4)-th smallest elements. (b) Use part (a) to derive your algorithm.

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Let A be an array of n integers, where n is divisible by 4. Describe an algorithm with O(n) time complexity
to decide whether there exists an element that occurs more than n/4 times in A.
(a) Show that if such an element exists in A, it must be either the (n/4)-th, or the (2n/4)-th, or the
(3n/4)-th smallest elements.
(b) Use part (a) to derive your algorithm.
Transcribed Image Text:Let A be an array of n integers, where n is divisible by 4. Describe an algorithm with O(n) time complexity to decide whether there exists an element that occurs more than n/4 times in A. (a) Show that if such an element exists in A, it must be either the (n/4)-th, or the (2n/4)-th, or the (3n/4)-th smallest elements. (b) Use part (a) to derive your algorithm.
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