Breaking changes
- Second argument of #push now defaults to the first argument
# it is now possible to write
array.each { |el| heap.push(el) }
# instead of
array.each { |el| heap.push(el, el) }
- PairingHeap#pop_priority was separated to two methods; PairingHeap#pop_priority and PairingHeap#pop_with_priority, similarly to SimplePairingHeap
New methods
#each returns an iterator of heap elements.PairingHeap#get_priority_if_exists returns a pair where first element is success flag, and second element is priority.
