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liliy
Group Title
which is faster/better
heapsort or quicksort or merge sort
{ example :to order a million random numbers}
 2 years ago
 2 years ago
liliy Group Title
which is faster/better heapsort or quicksort or merge sort { example :to order a million random numbers}
 2 years ago
 2 years ago

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rsmith6559 Group TitleBest ResponseYou've already chosen the best response.1
For randomly ordered data, quicksort is the fastest. Quicksort's achilles heel is nearly sorted data, it becomes slow. Merge sort is slower than quicksort on random data, but doesn't deteriorate on nearly sorted data. Check out wikipedia, they have some great info on sorting.
 2 years ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
but how abt heapsort?
 2 years ago

KonradZuse Group TitleBest ResponseYou've already chosen the best response.0
It's all about the Shell Sort baby!
 2 years ago

krithika Group TitleBest ResponseYou've already chosen the best response.0
As others have noted, worst case of Quicksort is O(n^2), while mergesort and heapsort stay at O(nlogn). On the average case, however, all three are O(nlogn); so they're for the vast majority of cases comparable. What makes Quicksort better on average is that the inner loop implies comparing several values with a single one, while on the other two both terms are different for each comparison. In other words, Quicksort does half as many reads as the other two algorithms. On modern CPUs performance is heavily dominated by access times, so in the end Quicksort ends up being a great first choice.
 2 years ago
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