Re: Ranking algorithm
On 20 Okt., 17:28, Juha Nieminen <nos...@thanks.invalid> wrote:
The problem is that after performing the heap sort, the array will be
in reverse order (in other words, rather than having the element with
the smallest score first, you'll have the element with the highest score
first).
No. At least not with default comparator according to
http://www.cplusplus.com/reference/algorithm/sort_heap.html
I guess sort_heap is implemented via (n-1) pop_heap invocations which
pop the largest element out of the heap (thus shrinking it) and
putting it at the end. So, the final order is from smallest to largest
elements.
I just want to mention another possibly very usefull STL algorithm:
partial_sort.
http://www.cplusplus.com/reference/algorithm/partial_sort.html
The OP could create a vector and push_back his objects until the
vector grows to a predetermined size limit -- ie N*2. Then, he could
use a partial_sort with std::greater as comparator, so that the first
N objects are the "biggest" and sorted in decreasing order and the
last N elements are the smallest N elements (unordered) which are then
discarded.
Cheers,
SG
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