我尝试在 python 中编写一个简单的合并和排序函数,但在出现以下错误后卡住了-
List out of range.
如果您能帮助我修复它并弄清楚如何避免它,我将不胜感激。我在下面添加了代码-
def merge(lst1, lst2):
# Gets two sorted lists and returns one merged and sorted list
merge_sorted = []
i = 0
j = 0
len1 = len(lst1) - 1
len2 = len(lst2) - 1
while i < len1 or j < len2:
if lst1[i] < lst2[j]:
merge_sorted.append(lst1[i])
i += 1
elif lst1[i] > lst2[j]:
merge_sorted.append(lst2[j])
j += 1
else:
merge_sorted.append(lst1[i])
merge_sorted.append(lst2[j])
i += 1
j += 1
return merge_sorted
lst1 = [2, 4, 5, 6, 8]
lst2 = [1, 3, 7, 9, 0]
merge(lst1, lst2)
我得到的:
IndexError Traceback (most recent call last)
<ipython-input-13-572aad47097b> in <module>()
22 lst1 = [2, 4, 5, 6, 8]
23 lst2 = [1, 3, 7, 9, 0]
---> 24 merge(lst1, lst2)
<ipython-input-13-572aad47097b> in merge(lst1, lst2)
7 len2 = len(lst2) - 1
8 while i < len1 or j < len2:
----> 9 if lst1[i] < lst2[j]:
10 merge_sorted.append(lst1[i])
11 i += 1
IndexError: list index out of range
最佳答案
你的问题是 while 条件:
while i < len1 or j < len2:
应该是and
- 如果任一条件不成立,您只需将非空列表的其余部分附加到您的结果即可。
您当前的代码仍然进入 while-body 并检查 if lst1[i] < lst2[j]:
如果 i
之一/j
比你得到的错误列表更大。
完整固定代码:
def merge(lst1, lst2):
# Gets two sorted lists and returns one merged and sorted list
merge_sorted = []
i = 0
j = 0
len1 = len(lst1) - 1
len2 = len(lst2) - 1
while i < len1 and j < len2: # use and
if lst1[i] < lst2[j]:
merge_sorted.append(lst1[i])
i += 1
elif lst1[i] > lst2[j]:
merge_sorted.append(lst2[j])
j += 1
else:
merge_sorted.append(lst1[i])
merge_sorted.append(lst2[j])
i += 1
j += 1
# add remainder lists - the slices evaluate to [] if behind the list lengths
merge_sorted.extend(lst1[i:]) # if i is aready out of the list this is []
merge_sorted.extend(lst2[j:]) # if j is aready out of the list this is []
return merge_sorted
lst1 = [2, 4, 5, 6, 8]
lst2 = [0, 1, 3, 7, 9] # fixed input, needs to be sorted, yours was not
print(merge(lst1, lst2))
输出:
[0, 1, 2, 3, 4, 5, 6, 8, 7, 9]
https://stackoverflow.com/questions/67241815/
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