归并排序

gzj137070928

# 单行输入多个变量的话，用input().split()读入并分解成列表
# 多个整数在一行，则用list(map(int,input().split()))来获取
# merge sort：归并排序

1. def merge_sort(lst):
   
2.     if len(lst) <= 1:
   
3.         return lst
   
4.     middle = int(len(lst) / 2)
   
5.     left = merge_sort(lst[:middle])
   
6.     right = merge_sort(lst[middle:])
   
7.     merged = []
   
8.     while left and right:
   
9.         merged.append(left.pop(0) if left[0] <= right[0] else right.pop(0))
   
10.     merged.extend(right if right else left)
    
11.     return merged
    
12. 
    
13. 
    
14. data_lst = [6, 202, 100, 301, 38, 8, 1]
    
15. print(merge_sort(data_lst))

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