用python写一个合并排序
时间: 2023-04-01 17:02:54 浏览: 64
可以使用以下代码实现合并排序:
def merge_sort(arr):
if len(arr) > 1:
mid = len(arr) // 2
left_half = arr[:mid]
right_half = arr[mid:]
merge_sort(left_half)
merge_sort(right_half)
i = j = k =
while i < len(left_half) and j < len(right_half):
if left_half[i] < right_half[j]:
arr[k] = left_half[i]
i += 1
else:
arr[k] = right_half[j]
j += 1
k += 1
while i < len(left_half):
arr[k] = left_half[i]
i += 1
k += 1
while j < len(right_half):
arr[k] = right_half[j]
j += 1
k += 1
return arr
arr = [3, 5, 1, 2, 4]
print(merge_sort(arr)) # 输出 [1, 2, 3, 4, 5]