Heap.py

This is the solution to the problem TheAlgorithms#9528

Author: Aloneking789

Diff for: Heap.py

@@ -0,0 +1,32 @@
+#Heap Sort algorithm in Python
+def heapify(arr, n, i):
+    largest = i
+    left = 2 * i + 1
+    right = 2 * i + 2
+
+    if left < n and arr[left] > arr[largest]:
+        largest = left
+
+    if right < n and arr[right] > arr[largest]:
+        largest = right
+
+    if largest != i:
+        arr[i], arr[largest] = arr[largest], arr[i]
+        heapify(arr, n, largest)
+
+def heap_sort(arr):
+    n = len(arr)
+
+    # Build a max heap.
+    for i in range(n // 2 - 1, -1, -1):
+        heapify(arr, n, i)
+
+    # Extract elements one by one.
+    for i in range(n - 1, 0, -1):
+        arr[i], arr[0] = arr[0], arr[i]
+        heapify(arr, i, 0)
+
+# Example usage:
+arr = [12, 11, 13, 5, 6, 7]
+heap_sort(arr)
+print("Sorted array is:", arr)