heap sort heapify and max heap in binary tree

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Souleymane
26 Jun 2017
1Implementation of heap sort in C:
2
3#include <stdio.h>
4int main()
5{
6   int heap[10], array_size, i, j, c, root, temporary;
7   printf("\n Enter size of array to be sorted :");
8   scanf("%d", &array_size);
9   printf("\n Enter the elements of array : ");
10   for (i = 0; i < array_size; i++)
11      scanf("%d", &heap[i]);
12   for (i = 1; i < array_size; i++)
13   {
14       c = i;
15       do
16       {
17           root = (c - 1) / 2;            
18           if (heap[root] < heap[c])   /* to create MAX heap array */
19           {                                  // if child is greater than parent swap them
20               temporary = heap[root];      // as structure is of complete binary tree
21               heap[root] = heap[c];     // it took logn steps to reach from root to leaf
22               heap[c] = temporary;
23           }
24           c = root;
25       } while (c != 0);
26   }
27   printf("Heap array : ");
28   for (i = 0; i < array_size; i++)
29       printf("%d\t ", heap[i]);         //printing the heap array
30   for (j = array_size - 1; j >= 0; j--)
31   {
32       temporary = heap[0];
33       heap[0] = heap[j] ;   /* swap max element with rightmost leaf element */
34       heap[j] = temporary;
35       root = 0;
36       do
37       {
38           c = 2 * root + 1;    /* left node of root element */
39           if ((heap[c] < heap[c + 1]) && c < j-1)
40               c++;
41           if (heap[root]<heap[c] && c<j)    /* again rearrange to max heap array */
42           {
43               temporary = heap[root];
44               heap[root] = heap[c];
45               heap[c] = temporary;
46           }
47           root = c;
48       } while (c < j);
49   }
50   printf("\n The sorted array is : ");
51   for (i = 0; i < array_size; i++)
52      printf("\t %d", heap[i]);
53}
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