topN using a heap

[deadalnix via Digitalmars-d]

On Monday, 18 January 2016 at 01:38:16 UTC, Andrei Alexandrescu 
wrote:
> On 1/17/16 8:07 PM, deadalnix wrote:
>> A common way to do it is to go quicksort, but only recurse on 
>> one side
>> of the set. That should give log(n)^2 complexity on average.
>
> Yah, that's quickselect (which this work started from). It's 
> linear, and you can't get top n in sublinear time because you 
> need to look at all elements. -- Andrei

Yeah; forget about me, I was dumb on that one.