ref: bef4f6bd8b652b434f708d287f4ed850e37b0345 dir: /fns.h/
void nukequeue(Pairheap**); Pairheap* popqueue(Pairheap**); void decreasekey(Pairheap*, double, Pairheap**); void pushqueue(double, void*, Pairheap**);