a 4-heap implementation..

This is a discussion on a 4-heap implementation.. within the C Programming forums, part of the General Programming Boards category; Hello, all: I wrote a function to implement a 4-heap with 100 data in it. But it cannot work correctly. ...

  1. #1
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    Jun 2003
    Posts
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    a 4-heap implementation..

    Hello, all:
    I wrote a function to implement a 4-heap with 100 data in it. But it cannot work correctly.
    the step is: first, read the data from a file and put them in to an array one by one. Second, use the percolate down (slide) algorithm to adjust the heap, and the relationship between the parents and the children is "the left most child = parent * 4 - 2", so the function is (without the data-read part):
    Code:
    void
    Im4Heap(int si, int i, PriorityQueue H)
    {
      int temp, num, pointer, child, start, end;
      temp = H->Elements[i];
      H->Size = si; 
      for (i; i * 4 - 2 <= H->Size; i = child)
        {
          start = i * 4 - 2;
          end = i * 4 + 1;
          child = i * 4 - 2;
          num = Smallest(&H->Elements[start], &pointer, start, end);
          if (temp > num)
    	H->Elements[i] = H->Elements[pointer];
          else
    	break;
        }
      H->Elements[i] = temp;
    }
    The "Smallest" function is used for finding the smallest value in an array:
    Code:
    int
    Smallest(int array[], int *i, int start, int end)
    {
      int num;
      num = array[start];
      for(*i = start; *i <= end; *i++)
        {
          if(array[*i] < num)
    	num = array[*i];
        }
      printf("%d\n", num);
      return num;
    }
    Thank you very much!

  2. #2
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    Join Date
    Jun 2003
    Posts
    69
    could anyone helps me?

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