c语言利用堆实现最大优先队列

#include
#include
#define PARENT(num) ((num)>>1)
#define LEFt(num) ((num)<<1)
#define RIGHt(num) ((num<<1)+1)

void build_max_heap(int* A, int size);
void max_heapify(int* A, int i, int heap_size);
int extract_max(int* A, int* size);
void insert(int** A, int x, int* size);
void display(int* num, int size);

void main() {
	int* num = (int*)malloc(40);
	int t[10]={5, 3, 5, -2, 4, 6, 7, 4, -1, 3};
	if (!num) {
		printf("error");
		exit(1);
	}
	for (int i = 0; i < 10; i++) {
		*(num + i) = t[i];
	}
	int size = 10;
	build_max_heap(num, size);
	display(num, size);
	extract_max(num, &size);
	display(num, size);
	insert(&num, 2, &size);
	display(num, size);

}

void max_heapify(int* A, int i, int heap_size) {
	int l = LEFt(i), r = RIGHt(i);
	int largest;
	if (l <= heap_size && A[l - 1] > A[i - 1])
		largest = l;
	else
		largest = i;
	if (r <= heap_size && A[r - 1] > A[largest - 1])
		largest = r;
	if (largest != i) {
		int t = A[i - 1];
		A[i - 1] = A[largest - 1];
		A[largest - 1] = t;
		max_heapify(A, largest, heap_size);
	}
}

void build_max_heap(int* A, int size) {
	int heap_size = size;
	for (int i = size / 2; i >= 1; i--) {
		max_heapify(A, i, heap_size);
	}
}

//返回具有最大关键字的元素
int maximun(int* num) {
	return num[0];
}

//返回并删除具有最大关键字的元素
int extract_max(int* A, int* size) {
	int heap_size = --(*size);
	int t = A[0];
	A[0] = A[*size];
	A[*size] = t;
	max_heapify(A, 1,heap_size);
	return A[*size];
}

//将x插入队列
void insert(int** A, int x,int* size) {
	int* num = (int*)malloc((*size) * 4 + 4);
	if (!num) {
		printf("errorn");
		exit(1);
	}
	for (int i = 0; i < *size; i++) {
		*(num+i) = *((*A)+i);
	}
	*(num+(*size)) = x;
	*A = num;
	int t = (*size) + 1;
	(*size)++;
	while (t > 1) {
		t = PARENT(t);
		max_heapify(*A, t, *size);
	}
}

void display(int* num, int size) {
	for (int i = 0; i < size; i++) {
		printf("%d ", num[i]);
	}
	printf("n");
}