#ifndef FOO_H_
#define FOO_H_

struct item;
struct priority_queue;

void insert(struct priority_queue *s, int key, int value);
struct item maximum(struct priority_queue *s);
struct item extract_maximum(struct priority_queue *s);
void increase_key(struct priority_queue *s, struct item x, struct item k);

#endif

#include "priority_queue.h"

struct item {
	int key;
	int value;
};

struct priority_queue {
	struct item s[100];
};


void insert(struct priority_queue *s, int key, int value) {

}

struct item maximum(struct priority_queue *s) {

}

struct item extract_maximum(struct priority_queue *s) {

}

void increase_key(struct priority_queue *s, struct item x, struct item k) {

}