左式堆（Leftist Heap）

左式堆(leftist heap)实现优先队列，原文地址：

左式堆函数操作声明

1、左式堆初始化

extern LeftistHeap *lheap_init();

2、检测左式堆是否已满

extern int lheap_is_full(LeftistHeap *heap);

3、左式堆是否为空

extern int lheap_is_empty(LeftistHeap *heap);

4、左式堆入队或插入

extern int lheap_push(LeftistHeap *heap, int key, Label *label);

5、获取左式堆队头元素

extern LNode *lheap_top(LeftistHeap *heap);

6、左式堆释放顶部元素

extern int lheap_pop(LeftistHeap *heap);

7、左式堆遍历

extern void lheap_traverse(LeftistHeap *heap);

8、左式堆释放和清除

extern int lheap_clear(LeftistHeap *heap);