Python 如何解决合并排序算法中的递归问题?
在示例中,我想使用合并排序对station的属性f进行排序Python 如何解决合并排序算法中的递归问题?,python,recursion,mergesort,Python,Recursion,Mergesort,在示例中,我想使用合并排序对station的属性f进行排序 class mergesort_algorithm(): def Merge_Sort(self,stations): length = len(stations) middle = int(length/2-1) if length<=1: return stations else: list1 = self.Merge_Sort(statio
class mergesort_algorithm():
def Merge_Sort(self,stations):
length = len(stations)
middle = int(length/2-1)
if length<=1:
return stations
else:
list1 = self.Merge_Sort(stations[:middle])
list2 = self.Merge_Sort(stations[middle:])
return self.Merge(list1,list2)
def Merge(self,list1,list2):
list3 = []
length1 = len(list1)
length2 = len(list2)
point1 = 0
point2 = 0
while point1<=length1-1 and point2<=length2-1:
if list1[point1].f<list2[point2].f:
list3.append(list1[point1])
point1 += 1
else:
list3.append(list2[point2])
point2 += 1
if point1>length1:
for i in range(list2):
if i>=point2:
list3.append(list2[point2])
if point2>length2:
for i in range(list1):
if i>=point1:
list3.append(list1[point1])
for item in list3:
print(item.name)
print("-----")
return list3
我不知道怎么解决它。似乎有这么多的递归。我找到了一些解决方案:
导入系统和系统设置递归限制(1000000)假设
len(站)
为2。然后middle
为0。所以stations[:middle]
是空的,但是stations[middle:
有长度2,并且有一个无限的递归。你如何调用这个代码?middle应该是middle=len(stations)//2#查找数组的middle
就像在其他@mkrieger1中一样有点复杂,这是我项目中的一个函数。谢谢!我以前没想过这个案子!
File "/home/surface/Final-Year-Project/FYP/Util/Mergesort_algorithm.py", line 16, in Merge_Sort
list1 = self.Merge_Sort(stations[:middle])
File "/home/surface/Final-Year-Project/FYP/Util/Mergesort_algorithm.py", line 17, in Merge_Sort
list2 = self.Merge_Sort(stations[middle:])
File "/home/surface/Final-Year-Project/FYP/Util/Mergesort_algorithm.py", line 17, in Merge_Sort
list2 = self.Merge_Sort(stations[middle:])
File "/home/surface/Final-Year-Project/FYP/Util/Mergesort_algorithm.py", line 17, in Merge_Sort
list2 = self.Merge_Sort(stations[middle:])
[Previous line repeated 989 more times]
File "/home/surface/Final-Year-Project/FYP/Util/Mergesort_algorithm.py", line 16, in Merge_Sort
list1 = self.Merge_Sort(stations[:middle])
File "/home/surface/Final-Year-Project/FYP/Util/Mergesort_algorithm.py", line 11, in Merge_Sort
middle = int(length/2-1)
RecursionError: maximum recursion depth exceeded while calling a Python object