
min_of_heap(+Heap, ?Key1, ?Datum1, ?Key2, ?Datum2)

   returns the smallest and second smallest pairs in the heap

Type
   library(heaps)

Description

    returns the smallest (Key1) and second smallest (Key2) pairs in
    the heap, without deleting them.  It fails if the heap does not
    have at least two elements.
    


