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How many iterations are required to sort the array arr={2,3,4,5,1} using bubble sort and cocktail sort respectively?

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How many iterations are required to sort the array arr={2,3,4,5,1} using bubble sort and cocktail sort respectively?

(a) 4,2

(b) 5,3

(c) 5,2

(d) 4,3

The question was posed to me at a job interview.

Asked question is from Sorting topic in chapter Sorting of Data Structures & Algorithms II

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The correct choice is (a) 4,2

The best explanation: Cocktail sort applies bubble sort in two phases until the array gets sorted. So here bubble sort will take 4 iterations to sort the given array whereas cocktail sort takes only 2 iterations. This shows cocktail sort has a comparatively better performance.

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