SRC/heapsort.h File Reference

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Functions
void	heapsort (int *sort_index, float *sort_values, int nelem)

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Function Documentation

void heapsort	(	int *	sort_index,
		float *	sort_values,
		int	nelem
	)

Definition at line 19 of file heapsort.c.

{

/* This routine loads sort_index [1..nelem] with nelem values:  the indices  *
 * of the sort_values [1..nelem] array that lead to sort_values[index] being *
 * decreasing as one goes through sort_index.  Sort_values is not changed.   */

    int i;

/* Build a heap with the *smallest* element at the top. */

    for(i = 1; i <= nelem; i++)
        add_to_sort_heap(sort_index, sort_values, i, i);

/* Now pull items off the heap, smallest first.  As the heap (in sort_index) *
 * shrinks, I store the item pulled off (the smallest) in sort_index,        *
 * starting from the end. The heap and the stored smallest values never      *
 * overlap, so I get a nice sort-in-place.                                   */

    for(i = nelem; i >= 1; i--)
        sort_index[i] = get_top_of_heap_index(sort_index, sort_values, i);
}

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