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Heap_Sort.c
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#include <stdio.h>
#include <stdlib.h>
void print(int *,int);
void swap(int *,int *);
void max_heap(int *,int,int);
void heap_sort(int *,int);
int main()
{
int arr[]={12, 11, 13, 5, 6, 7};
int n=sizeof(arr)/sizeof(arr[0]);
printf("SIZE OF ARRAY=%d\n",n);
printf("ORIGINAL ARRAY:");
print(arr,n);
printf("\n================================================\n");
heap_sort(arr,n);
printf("\nSORTED ARRAY ARRAY:");
print(arr,n);
printf("\n*************************************************************\n");
return 0;
}
void print(int arr[],int n)
{
printf("\n| ");
for(int i=0;i<n;i++)
{
printf(" %d |",arr[i]);
}
}
void swap(int *a,int *b)
{
int t=*a;
*a=*b;
*b=t;
}
void max_heap(int arr[],int n,int i)
{
int largest=i;
int l=(2*i)+1;
int r=(2*i)+2;
while(l<n&&arr[l]>arr[largest])
{
largest=l;
}
while(r<n&&arr[r]>arr[largest])
{
largest=r;
}
if(largest!=i)
{
swap(&arr[i],&arr[largest]);
max_heap(arr,n,largest);
}
}
void heap_sort(int arr[],int n)
{
for(int i=(n/2)-1;i>=0;i--)
{
max_heap(arr,n,i);
}
for(int i=n-1;i>=0;i--)
{
swap(&arr[0],&arr[i]);
max_heap(arr,i,0);
}
}