帮我用Python写一个排序代码
时间: 2023-06-01 10:02:32 浏览: 60
以下是一些常见的排序算法的Python实现:
1. 冒泡排序
```python
def bubble_sort(arr):
n = len(arr)
for i in range(n):
for j in range(n-i-1):
if arr[j] > arr[j+1]:
arr[j], arr[j+1] = arr[j+1], arr[j]
return arr
```
2. 选择排序
```python
def selection_sort(arr):
n = len(arr)
for i in range(n):
min_idx = i
for j in range(i+1, n):
if arr[j] < arr[min_idx]:
min_idx = j
arr[i], arr[min_idx] = arr[min_idx], arr[i]
return arr
```
3. 插入排序
```python
def insertion_sort(arr):
n = len(arr)
for i in range(1, n):
key = arr[i]
j = i-1
while j >= 0 and key < arr[j]:
arr[j+1] = arr[j]
j -= 1
arr[j+1] = key
return arr
```
4. 快速排序
```python
def quick_sort(arr):
if len(arr) <= 1:
return arr
pivot = arr[0]
left = []
right = []
for i in range(1, len(arr)):
if arr[i] < pivot:
left.append(arr[i])
else:
right.append(arr[i])
return quick_sort(left) + [pivot] + quick_sort(right)
```
5. 归并排序
```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
result += left[i:]
result += right[j:]
return result
```
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