Merging ShellSort

sorting.py

@@ -2,11 +2,13 @@
 
 """
 Programadores:
-
+Carlos J Corrada Bravo
+Diego Rodríguez
+Joel González
+Javier Santiago
+Luis Jusino
 """
-
 """
-Carlos J Corrada Bravo
 Este programa calcula el promedio de tiempo de ejecución de cuatro algoritmos de ordenamiento
 La variable maxValor define el valor maximo de los elementos de la lista
 La variable largoLista define el largo de las listas a ordenar
@@ -54,12 +56,47 @@ def heapSort(listaHeap):
 		heapify(listaHeap, i, 0)
 	return listaHeap
 
+	return lista
+#Se le da credito al programador de la funcion al final del codigo
+
 def quickSort(lista):
-	#definan el algoritmo de ordenamiento quicksort
+	#definan el algoritmo de ordenamiento quicksort                        
 	return lista
 
 def shellSort(lista):
-	#definan el algoritmo de ordenamiento shellsort
+	# Subarrays are sorted according to intervals
+	# After each set of subarrays is sorted, interval value is updated and process repeats
+	# Function stops once iteration with interval = 1 has executed
+	# print(lista)
+	interval = len(lista) // 2
+	while interval > 0:
+		# Process repeats for each value between 1 -> interval
+		for i in range(0, interval):
+			# Starting index determines initial portion of the array that is sorted
+			sortedIndex = i
+			# Process repeats as long as the current value being considered is greater than the value to its left
+			# Being greater than the value to its left means that it is not in the correct location
+			j = i
+			while j + interval < len(lista):
+				if lista[j] > lista[j + interval]:
+					# Swapping values so that smaller value is to the left
+					temp = lista[j]
+					lista[j] = lista[j + interval]
+					lista[j + interval] = temp
+					# print(lista)
+					n = j
+					# Continue comparing value that was swapped left to other values to the left to make sure it is placed in the correct location
+					while n - interval >= 0 and lista[n] < lista[n - interval]:
+						# Swapping values so that smaller value is to the left
+						temp = lista[n]
+						lista[n] = lista[n - interval]
+						lista[n - interval] = temp
+						n -= interval
+				# print(lista)
+				# Update index to continue comparison with the next value in the sub array
+				j += interval
+		interval //= 2
+	# print(lista)
 	return lista
 
 maxValor=1000 	#define el valor maximo de los elementos de la lista
@@ -102,3 +139,4 @@ print "MergeSort " + str(acumulaMerge/veces) + " segundos"
 print "HeapSort " + str(acumulaHeap/veces) + " segundos"
 print "QuickSort " + str(acumulaQuick/veces) + " segundos"
 print "ShellSort " + str(acumulaShell/veces) + " segundos"
+