typedef struct Priq Priq;struct Priq{	void **elem;	int n;	int alloc;}; /* alg.c */typedef int (*pricmp)(void *v1, void *v2);Priq *priqnew(int size);void priqfree(Priq *q);void priqpush(Priq *q, void *val, pricmp cmp);void *priqpop(Priq *q, pricmp cmp);void *priqtop(Priq *q);int priqhas(Priq *q, void *val); Point *neighbor(Rectangle in, Point p, int *n);void shuffle(void *base, long nel, long width);