我正在解决一个问题，我需要合并两个字符串，以便一个字符串可以在另一个字符串中。合并的字符串的长度应最短。
示例：
str1 = "AABAK"
str2 = "HYUAABA"
merged string = "HYUAABAK"
到目前为止，我已经能够使它以类似的子字符串结尾的字符串工作，但是如果相反，那么我的解决方案将无法正常工作。
失败：
str1 = 'ctaagt'
str2 = 'gcta'
expected answer: gctaagt
解决方案：
def overlap(str1, str2):
l = min(len(str1), len(str2))
for i in range(l, -1, -1):
if str1.endswith(str2[-i:]):
print('overlap ' + str2[-i:])
return str2[-i:]
str1 = "AABAK"
str2 = "HYUAABA"
for i in range(len(str1), -1, -1):
res = overlap(str1[0:i], str2)
if(res):
print('merge ' + str2+str1[i:])
break
我也想知道是否有更好或更清洁的方法来解决这个问题。
注意：出于测试目的，str1故意短了。
答案 0 :(得分：1)
您可以修改Collecting pandas
Downloading https://files.pythonhosted.org/packages/86/ad/89670f4017b2459dfb5577775efbc4c6c20eb46728ac6e5b721602493724/pandas-0.23.4-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (15.0MB)
100% |████████████████████████████████| 15.0MB 1.5MB/s
Requirement already satisfied: pytz>=2011k in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from pandas) (2013.7)
Collecting python-dateutil>=2.5.0 (from pandas)
Downloading https://files.pythonhosted.org/packages/74/68/d87d9b36af36f44254a8d512cbfc48369103a3b9e474be9bdfe536abfc45/python_dateutil-2.7.5-py2.py3-none-any.whl (225kB)
100% |████████████████████████████████| 235kB 20.5MB/s
Requirement already satisfied: numpy>=1.9.0 in /Library/Python/2.7/site-packages (from pandas) (1.15.4)
Requirement already satisfied: six>=1.5 in /Library/Python/2.7/site-packages/six-1.11.0-py2.7.egg (from python-dateutil>=2.5.0->pandas) (1.11.0)
matplotlib 1.3.1 requires nose, which is not installed.
matplotlib 1.3.1 requires tornado, which is not installed.
Installing collected packages: python-dateutil, pandas
Found existing installation: python-dateutil 1.5
Uninstalling python-dateutil-1.5:
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以返回最终的重叠字符串。然后，可以考虑overlap和str1的可能排列，并选择str2为字符串长度的min的最终结果：
key答案 1 :(得分：0)
使用tobias_k's solution from a previous post作为参考，您可以执行以下操作。然后只需将a，b和b，a的输出进行比较，看看哪个结果字符串更短。
from functools import reduce
a = "AABAK"
b = "HYUAABA"
def overlap(a, b):
return max(i for i in range(len(b)) if b[i - 1] == a[-1] and a.endswith(b[:i]))
reduce(lambda a, b: a + b[overlap(a, b):], [b, a])
答案 2 :(得分：0)
您可以很简单地计算重叠并在相同的循环中进行字符串合并：
def merge(str1, str2):
str2_len = len(str2)
for i in range(str2_len):
# edited to only match correctly
if str1.startswith(str2[i:]):
return str2 + str1[str2_len-i:]
return str2 + str1
>>> str1 =“ AABAK”
>>> str2 =“ HYUAABA”
>>> merge（str1，str2）
'HYUAABAK'
>>> str1 ='ctaagt'
>>> str2 ='gcta'
>>> merge（str1，str2）
'gctaagt'