I think they mean https://en.wikipedia.org/wiki/Heap_(data_structure) https://en.wikipedia.org/wiki/Heap_(data_structure), but their claims are so odd that it’s

I think they mean https://en.wikipedia.org/wiki/Heap_(data_structure) https://en.wikipedia.org/wiki/Heap_(data_structure), but their claims are so odd that it’s hard to tell.