python二路归并
时间: 2023-10-30 10:05:49 浏览: 57
二路归并是一种常见的排序算法,它将两个已排序的数组或链表合并成一个排序的数组或链表。下面是一个用Python实现的简单二路归并的例子:
```python
def merge_sort(arr):
if len(arr) <= 1:
return arr
mid = len(arr) // 2
left = arr[:mid]
right = arr[mid:]
left = merge_sort(left)
right = merge_sort(right)
return merge(left, right)
def merge(left, right):
result = []
i = j = 0
while i < len(left) and j < len(right):
if left[i] < right[j]:
result.append(left[i])
i += 1
else:
result.append(right[j])
j += 1
while i < len(left):
result.append(left[i])
i += 1
while j < len(right):
result.append(right[j])
j += 1
return result
# 示例使用
arr = [9, 5, 7, 2, 8, 4, 1, 3, 6]
sorted_arr = merge_sort(arr)
print(sorted_arr)
```
输出结果为:[1, 2, 3, 4, 5, 6, 7, 8, 9]