Answer to Question #156807 in Databases | SQL | Oracle | MS Access for Josh

Question

1.  Which of the following options is an instance of divide and conquer

a. merge sort

b. Bubble sort

c. selection sort

d. insertion sort

Answer 1

Answer:

A. Quick Sort and B. Merge Sort

Explanation:

Quick sort uses a divide-and-conquer strategy. It works by selecting a 'pivot' element from the sorting-array and partitioning the other elements into two sub-arrays, according to whether they are less than or greater than the pivot-value. The sub-arrays are then sorted recursively.

Merge sort follows steps in divide-and conquer fashion:

- Divide the unsorted array into n sub-arrays, each containing one element (array of one element is considered sorted).

- Repeatedly merge sub-arrays to produce new sorted sub-arrays until there is only one sub-array remaining. This will be the sorted array.