python3 快速排序列表索引超出范围
python3 quicksort list index out of range
嗨,我是 Python 的新手,当我为快速排序算法实现以下代码时,我得到了回溯:"IndexError: list index out of range".
谁能帮帮我,拜托。挣扎了一晚上!
谢谢!
def quicksort(array,l,r):
n = len(array)
if n == 1 or n == 0:
return array
else:
p = array[l]
i = l + 1
for j in range(l+1, r):
if array[j] < p:
array[i], array[j] = array[j], array[i]
i = i + 1
array[l], array[i-1] = array[i-1], array[l]
array[l:i-1] = quicksort(array[l:i-1],l,i-1)
array[i:r] = quicksort(array[i:r],i,r)
return array
testarray = [1,3,4,5,2]
sortedarray = quicksort(testarray,0,5)
修复了错误,但我认为你的排序逻辑是错误的
def quicksort(array,l,r):
n = len(array)
if n == 1 or n == 0:
return array
else:
p = array[l]
i = l + 1
for j in range(1, r-1): # r is length of array; so range should be one less
if array[j] < p:
array[i], array[j] = array[j], array[i]
i = i + 1
array[l], array[i-1] = array[i-1], array[l]
array[l:i-1] = quicksort(array[l:i-1],l,i-1)
array[i:r] = quicksort(array[i:r],i,r)
return array
testarray = [1,3,4,5,2]
sortedarray = quicksort(testarray,0,5)
print(sortedarray)
输出
[1, 3, 2, 4, 5]
嗨,我是 Python 的新手,当我为快速排序算法实现以下代码时,我得到了回溯:"IndexError: list index out of range".
谁能帮帮我,拜托。挣扎了一晚上!
谢谢!
def quicksort(array,l,r):
n = len(array)
if n == 1 or n == 0:
return array
else:
p = array[l]
i = l + 1
for j in range(l+1, r):
if array[j] < p:
array[i], array[j] = array[j], array[i]
i = i + 1
array[l], array[i-1] = array[i-1], array[l]
array[l:i-1] = quicksort(array[l:i-1],l,i-1)
array[i:r] = quicksort(array[i:r],i,r)
return array
testarray = [1,3,4,5,2]
sortedarray = quicksort(testarray,0,5)
修复了错误,但我认为你的排序逻辑是错误的
def quicksort(array,l,r):
n = len(array)
if n == 1 or n == 0:
return array
else:
p = array[l]
i = l + 1
for j in range(1, r-1): # r is length of array; so range should be one less
if array[j] < p:
array[i], array[j] = array[j], array[i]
i = i + 1
array[l], array[i-1] = array[i-1], array[l]
array[l:i-1] = quicksort(array[l:i-1],l,i-1)
array[i:r] = quicksort(array[i:r],i,r)
return array
testarray = [1,3,4,5,2]
sortedarray = quicksort(testarray,0,5)
print(sortedarray)
输出
[1, 3, 2, 4, 5]