Merge pull request akshitagit#138 from N00rAhmed/SecondBranch

akshitagupta15june · web-flow · commit ace286357898 · 2022-10-01T08:13:28.000+05:30
added HeapSort to Sorts folder in Python Programming Language
diff --git a/Sorts/HeapSort.py b/Sorts/HeapSort.py
@@ -0,0 +1,57 @@
+# Python program for implementation of heap Sort
+
+# To heapify subtree rooted at index i.
+# n is size of heap
+
+
+def heapify(arr, N, i):
+	largest = i # Initialize largest as root
+	l = 2 * i + 1	 # left = 2*i + 1
+	r = 2 * i + 2	 # right = 2*i + 2
+
+	# See if left child of root exists and is
+	# greater than root
+	if l < N and arr[largest] < arr[l]:
+		largest = l
+
+	# See if right child of root exists and is
+	# greater than root
+	if r < N and arr[largest] < arr[r]:
+		largest = r
+
+	# Change root, if needed
+	if largest != i:
+		arr[i], arr[largest] = arr[largest], arr[i] # swap
+
+		# Heapify the root.
+		heapify(arr, N, largest)
+
+# The main function to sort an array of given size
+
+
+def heapSort(arr):
+	N = len(arr)
+
+	# Build a maxheap.
+	for i in range(N//2 - 1, -1, -1):
+		heapify(arr, N, i)
+
+	# One by one extract elements
+	for i in range(N-1, 0, -1):
+		arr[i], arr[0] = arr[0], arr[i] # swap
+		heapify(arr, i, 0)
+
+
+# Driver's code
+if __name__ == '__main__':
+	arr = [12, 11, 13, 5, 6, 7]
+
+	# Function call
+	heapSort(arr)
+	N = len(arr)
+
+	print("Sorted array is")
+	for i in range(N):
+		print("%d" % arr[i], end=" ")
+
+# Provided by Noor Ahmed
