Merge pull request #451 from THEAYUSHIMISHRA/patch-4

Create HeapSort

Programs in different languages/Heap Sort.c

@@ -0,0 +1,52 @@
+#include<stdio.h>
+#include<conio.h>
+void swap(int *x,int *y)
+{
+	int temp;
+	temp=*x;
+	*x=*y;
+	*y=temp;
+}
+void heapify(int arr[],int n,int i)
+{   //initial largest as root
+	int largest=i;
+	int l=(2*i)+1;//left
+	int r=(2*i)+2;//right
+	//left child is greater han right child
+	if(l<n &&arr[l] >arr[largest])
+		largest=l;
+	//right child is greater han left child
+	if(r<n &&arr[r] >arr[largest])   
+    	largest=r;   
+    if(largest!=i)   //if largest is not root   
+    {
+    	swap(& arr[i],& arr[largest]);
+    	//recursively heapify the affected subtree
+        heapify(arr,n,largest);  	
+	}
+}
+void heapsort(int arr[],int n)
+{
+	int i;
+	//build heap(rearrange array)
+	for(i=(n/2)-1;i>=0;i--)
+		heapify(arr,n,i);
+	for(i=n-1;i>0;i--)  //one by one extract element from heap
+	{
+		swap(&arr[0],&arr[i]); //move curr to end
+		heapify(arr,i,0);      //calling max heapify on reduced heapify
+		}	
+}
+int main()
+{
+	int arr[10],i,n;
+	printf("Enter number of elements to be sorted:\t");
+	scanf("%d",&n);
+	printf("Enter the element\n");
+	for(i=0;i<n;i++)
+		scanf("%d",&arr[i]);
+	heapsort(arr,n);
+	printf("Sorted Array ");
+	for(i=0;i<n;i++)
+		printf("%d ",arr[i]);	
+}