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Heap_sort.c
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Heap_sort.c
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//HEAP SORT using C Program
#include <stdio.h>
void swap(int* a, int* b)
{
int temp = *a;
*a = *b;
*b = temp;
}
// To heapify a subtree rooted with node i
// which is an index in arr[].
// n is size of heap
void heapify(int arr[], int N, int i)
{
// Find largest among root, left child and right child
// Initialize largest as root
int largest = i;
// left = 2*i + 1
int left = 2 * i + 1;
// right = 2*i + 2
int right = 2 * i + 2;
// If left child is larger than root
if (left < N && arr[left] > arr[largest])
largest = left;
// If right child is larger than largest
// so far
if (right < N && arr[right] > arr[largest])
largest = right;
// Swap and continue heapifying if root is not largest
// If largest is not root
if (largest != i) {
swap(&arr[i], &arr[largest]);
// Recursively heapify the affected
// sub-tree
heapify(arr, N, largest);
}
}
// Main function to do heap sort
void heapSort(int arr[], int N)
{
// Build max heap
for (int i = N / 2 - 1; i >= 0; i--)
heapify(arr, N, i);
// Heap sort
for (int i = N - 1; i >= 0; i--) {
swap(&arr[0], &arr[i]);
// Heapify root element to get highest element at
// root again
heapify(arr, i, 0);
}
}
void printArray(int arr[], int N)
{
for (int i = 0; i < N; i++)
printf("%d ", arr[i]);
printf("\n");
}
// Driver's code
int main()
{
int i, n;
printf("Enter the number of elements in the array : ");
scanf("%d",&n);
int arr[n];
printf("Enter the elements in the array : ");
for(i = 0;i<n;i++){
scanf("%d",&arr[i]);
}
printf("Entered array is : ");
printArray(arr, n);
printf("\n");
heapSort(arr, n);
printf("Sorted array is\n");
printArray(arr, n);
}