写查找排序代码
时间: 2023-08-06 15:25:03 浏览: 43
以下是Python实现的常见查找和排序算法的代码:
1. 线性查找
```python
def linear_search(arr, x):
for i in range(len(arr)):
if arr[i] == x:
return i
return -1
```
2. 二分查找
```python
def binary_search(arr, x):
low = 0
high = len(arr) - 1
while low <= high:
mid = (low + high) // 2
if arr[mid] < x:
low = mid + 1
elif arr[mid] > x:
high = mid - 1
else:
return mid
return -1
```
3. 冒泡排序
```python
def bubble_sort(arr):
n = len(arr)
for i in range(n):
for j in range(0, n-i-1):
if arr[j] > arr[j+1]:
arr[j], arr[j+1] = arr[j+1], arr[j]
```
4. 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[min_idx] > arr[j]:
min_idx = j
arr[i], arr[min_idx] = arr[min_idx], arr[i]
```
5. 插入排序
```python
def insertion_sort(arr):
for i in range(1, len(arr)):
key = arr[i]
j = i - 1
while j >= 0 and key < arr[j]:
arr[j+1] = arr[j]
j -= 1
arr[j+1] = key
```
6. 快速排序
```python
def quick_sort(arr, low, high):
if low < high:
pi = partition(arr, low, high)
quick_sort(arr, low, pi-1)
quick_sort(arr, pi+1, high)
def partition(arr, low, high):
pivot = arr[high]
i = low - 1
for j in range(low, high):
if arr[j] < pivot:
i += 1
arr[i], arr[j] = arr[j], arr[i]
arr[i+1], arr[high] = arr[high], arr[i+1]
return i+1
```
以上是一些常见的查找和排序算法的Python实现,希望可以帮助到您。