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Added Mergesort algorithm

AngelRomero5 2 years ago
parent
commit
2aea5dde9f
1 changed files with 38 additions and 5 deletions
  1. 38
    5
      sorting.py

+ 38
- 5
sorting.py View File

@@ -9,10 +9,41 @@ Al final se imprimen los promedios de cada algortimo
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 from random import randint
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 import time
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 from copy import deepcopy
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+import sys
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+
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+# This function was created to prevent program from stopping before recursion finished
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+# Changes python's recursion limit
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+class recursion_depth:
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+    def __init__(self, limit):
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+        self.limit = limit
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+        self.default_limit = sys.getrecursionlimit()
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+
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+    def __enter__(self):
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+        sys.setrecursionlimit(self.limit)
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+
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+    def __exit__(self, type, value, traceback):
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+        sys.setrecursionlimit(self.default_limit)
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+
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+# Mergesort algorithm
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+def mergeSort(lista): # Ángel G. Romero Rosario on 10082022
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+	
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+	def merge(l1, l2):
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+		if len(l1) == 0:
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+			return l2
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+		elif len(l2) == 0:
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+			return l1
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+		elif l1[0] < l2[0]:
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+			return l1[0:1] + merge(l1[1:],l2)       # If l1[0] < l2[0] save l1[0] first to the list and call the function again
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+		else:
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+			return l2[0:1] + merge(l1, l2[1:])		# If l2[0] < l1[0] save l2[0] first to the list and call the function again
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+	
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+	if len(lista) <= 1:								# If there are no more items, return lista
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+		return lista
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+
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+	else:
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+		mid = len(lista) // 2 						# Find the middle in lista and call function to merge lista
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+		return merge(mergeSort(lista[:mid]), mergeSort(lista[mid:]))
12 46
 
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-def mergeSort(lista):
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-	#definan el algoritmo de ordenamiento mergesort
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-	return lista
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 def heapSort(lista):
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 	#definan el algoritmo de ordenamiento heapsort
@@ -35,7 +66,7 @@ def timeCode(fn):
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 	return (duration, res)
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 maxValor = 1000 	#define el valor maximo de los elementos de la lista
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-largoLista = 1000 #define el largo de las listas a ordenar
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+largoLista = 1000   #define el largo de las listas a ordenar
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 veces = 100 		#define las veces que se va a hacer el ordenamiento
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 acumulaMerge = 0 	#variable para acumular el tiempo de ejecucion del mergesort
@@ -49,7 +80,9 @@ for i in range(veces):
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 	quicklista = deepcopy(mergelista)
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 	searchlista = deepcopy(mergelista)
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-	acumulaMerge += timeCode(lambda: mergeSort(mergelista))[0]
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+	with recursion_depth(1500): # This function excedes python's recursion limit
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+		acumulaMerge += timeCode(lambda: mergeSort(mergelista))[0]
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+
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 	acumulaHeap += timeCode(lambda: heapSort(heaplista))[0]
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 	acumulaQuick += timeCode(lambda: quickSort(quicklista))[0]
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 	acumulaShell += timeCode(lambda: shellSort(searchlista))[0]