Question

I read that it’s possible to make quicksort run at O(nlogn)

the algorithm says on each step choose the median as a pivot

but, suppose we have this array:

10 8 39 2 9 20

which value will be the median?

In math if I remember correct the median is (39+2)/2 = 41/2 = 20.5

I don’t have a 20.5 in my array though

thanks in advance

Answer 1

You can choose either of them; if you consider the input as a limit, it does not matter as it scales up.