ref: 6c9eb7f74993179a823f4e1c02793786d51bf773 dir: /fns.h/
void nukequeue(Pairheap**); Pairheap* popqueue(Pairheap**); void decreasekey(Pairheap*, double, Pairheap**); void pushqueue(double, void*, Pairheap**);