Add C++ program of Heap_Sort

sorting/heap_sort_without_vectors.cpp

@@ -0,0 +1,64 @@
+//
+// C++ program for implementation of Heap Sort
+//
+// The All ▲lgorithms Project
+//
+// https://allalgorithms.com/
+// https://github.com/allalgorithms/cpp
+//
+// Contributed by: Kaushlendra Pratap
+// Github: @kaushl1998
+//
+#include <iostream>
+
+using namespace std;
+void heapify(int arr[], int n, int i)
+{
+	int largest = i;
+	int l = 2*i + 1;
+	int r = 2*i + 2; 
+
+
+	if (l < n && arr[l] > arr[largest])
+		largest = l;
+
+	if (r < n && arr[r] > arr[largest])
+		largest = r;
+
+	if (largest != i)
+	{
+		swap(arr[i], arr[largest]);
+
+		heapify(arr, n, largest);
+	}
+}
+
+void heapSort(int arr[], int n)
+{
+	for (int i = n / 2 - 1; i >= 0; i--)
+		heapify(arr, n, i);
+
+	for (int i=n-1; i>=0; i--)
+	{
+		swap(arr[0], arr[i]);
+		heapify(arr, i, 0);
+	}
+}
+
+void printArray(int arr[], int n)
+{
+	for (int i=0; i<n; ++i)
+		cout << arr[i] << " ";
+	cout << "\n";
+}
+
+int main()
+{
+	int arr[] = {12, 11, 13, 5, 6, 7};
+	int n = sizeof(arr)/sizeof(arr[0]);
+
+	heapSort(arr, n);
+
+	cout << "Sorted array is \n";
+	printArray(arr, n);
+}