hacktoberfest-2022

Heap_Sort.cpp

@@ -0,0 +1,69 @@
+// C++ program for implementation of Heap Sort
+
+#include <iostream>
+using namespace std;
+
+
+void heapify(int arr[], int N, int i)
+{
+
+
+	int large = i;
+
+
+	int l = 2 * i + 1;
+
+	int r = 2 * i + 2;
+
+
+	if (l < N && arr[l] > arr[large])
+		large = l;
+
+	if (r < N && arr[r] > arr[large])
+		large = r;
+
+	if (large != i) {
+		swap(arr[i], arr[large]);
+
+		heapify(arr, N, large);
+	}
+}
+
+
+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]);
+
+	// Function call
+	heapSort(arr, N);
+
+	cout << "Sorted array is \n";
+	printArray(arr, N);
+}