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The best case behaviour occurs for quick sort is, if partition splits the array of size n into __________

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The best case behaviour occurs for quick sort is, if partition splits the array of size n  into __________

(a) n/2 : (n/2) – 1

(b) n/2 : n/3

(c) n/4 : 3n/2

(d) n/4 : 3n/4

I have been asked this question during an interview.

The question is from Quicksort in chapter Sorting of Data Structures & Algorithms II

1 Answer

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Best answer
Right choice is (a) n/2 : (n/2) – 1

The best I can explain: The best case analysis of quick sort occurs when the partition splits the array into two subarrays, each of size no more than n/2 since one is of size n/2 and one of size (n/2) – 1.

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