小顶堆---非递归C语言来一发

 #include <stdio.h>
 #include <stdlib.h>

 #define HEAP_SIZE 100
 #define HEAP_FULL_VALUE -100

 #if 0
 /*小顶堆存储结构*/
 typedef struct small_heap
 {
     int data[HEAP_SIZE];
     int num;
 }SMALL_HEAP;
 #endif

 /*
  * name: heap_Swap
  *
  * purpose:
  *     swap two value of heap
  */
 static void heap_Swap(int heap[],int index_src,int index_dst)
 {
     int tmp = heap[index_src];

     heap[index_src] = heap[index_dst];
     heap[index_dst] = tmp;
 }

 /*
  * name: heap_Up
  *
  * purpose:
  *     move up value of the index position to adjust heap struct
  */
 static void heap_Up(int heap[],int index)
 {
     int parent = index / ;

     while(parent >= )
     {
         if(heap[index] < heap[parent])
         {
             heap_Swap(heap,index,parent);
             index = parent;
         }
         else
         {
             break;
         }
     }
 }

 /*
  * name: heap_Down
  *
  * purpose:
  *     move down value of the index position to adjust heap struct
  */
 static void heap_Down(int heap[],int index,int heap_data_num)
 {
     if(index *  > heap_data_num)
     {//leaf node can not move down
         return;
     }

     while(index *  <= heap_data_num)
     {
         int child = index * ; // left child 

         if(child > heap_data_num)
         {
             return;
         }

         if(child *  < heap_data_num)
         {//the node have two child
          //use multiply 2 to judge not use divide 2 to judge to pretend error
             if(heap[child + ] < heap[child])
             {
                 child += ; //right child is smaller update
             }

         }

         if(heap[child] < heap[index])
         {//the child samller than index swap value
             heap_Swap(heap,index,child);
             index = child;
         }
         else
         {
             break;
         }
     }
 }

 /*
  * name: heap_Insert
  *
  * purpose:
  *     insert a value into heap and ajust heap struct
  */
 void heap_Insert(int heap[],int *heap_data_num,int value)
 {
     if(*heap_data_num == )
     {
         heap[] = HEAP_FULL_VALUE; //data 0 do not save in the heap
     }

     (*heap_data_num)++;    //update heap size
     heap[*heap_data_num] = value; //add value to heap

     heap_Up(heap,*heap_data_num); //adjust heap struct
 }

 /*
  * name: heap_Delete
  *
  * purpost:
  *     delete a value from heap
  */
 void heap_Delete(int heap[],int *heap_data_num,int value)
 {
     int index;

     for(index = ; index <= *heap_data_num; index++)
     {
         if(heap[index] == value)
         {
             break;
         }
     }

     if(index > *heap_data_num)
     {//the value is not exist
         return;
     }

     heap[index] = heap[*heap_data_num]; //set the index value as final value

     (*heap_data_num)--;//the final value is not as the heap

     heap_Down(heap,index,*heap_data_num); //move down 

     int parent = index / ;
     if(parent >  && heap[index] < heap[parent])
     {//ajust to the special situation
         heap_Up(heap,index);
     }    

     heap[*heap_data_num + ] = HEAP_FULL_VALUE; //delete final data
 }

 void heap_Print(int heap[],int heap_data_num)
 {
     int i;
     for(i = ; i <= heap_data_num; i++)
     {
         printf("%d ",heap[i]);
     }

     printf("\n");
 }

 int main()
 {
     int heap[HEAP_SIZE];
     int i,heap_data_num = ;

     for(i = ; i < heap_data_num; i++)
     {
         heap[i] = HEAP_FULL_VALUE;
     }

 #if 0
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);

     heap_Print(heap,heap_data_num);

     heap_Delete(heap,&heap_data_num,);
     heap_Print(heap,heap_data_num);
     heap_Delete(heap,&heap_data_num,);
     heap_Print(heap,heap_data_num);

 #endif

 #if 1
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);
     heap_Insert(heap,&heap_data_num,);

     heap_Print(heap,heap_data_num);

     heap_Delete(heap,&heap_data_num,);

     heap_Print(heap,heap_data_num);
 #endif

 }

注：需要注意一点就是在进行节点是否有两个孩子的判断时，要用*2去判断，不能用除2判断，因为除2自动取整会导致少1的错误。