Quick Sort vs Selection Sort (Java vs C++)?

Your quicksort function returns your entire vector by value on every recursive call, even though the function modifies it in place. Probably returning all those temporaries and then throwing them away hurts performance.

You are returning a complete vector on every recursive call. This takes a lot of time (99,99% of the time spent copying).

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.