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which sorting method works fastest: 1.randomized array 2.nearly sorted array 3.reversed 4.array with duplicates *(assume that it is a large array with like 100,000 numbers)

Computer Science
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nearly sorted
no, i think u misunderstood my question. basically i need to do it 4 diff ways and seee hich one is the best for diff methods these are my answers: ranomized:best is: mergesort reverse:bubblesort nearly sorted:bubblesort duplicates: selectionsort
what u wanna know?

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Other answers:

if my choices are correct/make sense/ like for a randomized array, it is sorted fastest using mergesort reverse is fastest with bubble...
isnt reverse better with insertion sort?
oh, ya, but thats not one of my choices.. i have buble sort,mege, selection
use merge here because bubble sort will take more steps
Of your choices, merge sort is by far the best. Quicksort is probably the other major alternative to have a look at. A cool one for arrays with only a small range of possible numbers is counting sort: http://en.wikipedia.org/wiki/Counting_sort
Merge sort and Randomised Quicksort have running times of O(n lg n). Bubble sort and Selection sort is O(n^2) Now O(n lg n) is faster than O( n^2), for a large enough n. Hence, Merge sort and Quicksort beats Bubble and Selection sort. Also, Counting sort has linear running time O(n). So, that's even better that O(n lg n), but it's complex and a little hard to understand.
http://www.sorting-algorithms.com/
the url above tells me randomized -> merge sort revese -> shell sort nearly sorted->insertion sort duplicates -> quick sort, but insertion works quite good as well.

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