给定一个字符串,我该如何分解它,使得在n,n + 1处没有连续的相同字母,其中n是偶数。
意思是,我如何让“abba”保持“abba”,但将“abbb”变成“abbXb”。
由于
答案 0 :(得分:1)
因为每个人都喜欢单行:
strings = ['ab', 'abba', 'abbb', 'abbba', 'abbababababbbaaaa', 'abcacbbbddbabbdd']
for s in strings:
r = ''.join('X' + v if (k and k % 2 and v == s[k - 1]) else v for (k,v) in enumerate(s))
print s, '->', r
代码如下:查看字符串中的每个字符。如果它不是第一个并且它的索引是偶数并且它与之前的字符相同,则在字符前加'X'
。
输出:
ab -> ab
abba -> abba
abbb -> abbXb
abbba -> abbXba
abbababababbbaaaa -> abbababababXbbaaXaa
abcacbbbddbabbdd -> abcacbbXbdXdbabXbdXd
答案 1 :(得分:0)
做自己的功课,凯文。
def foo(text, separator):
if len(text) < 2:
return text
result = ""
for i in range(1, len(text), 2):
if text[i] == text[i - 1]:
result += text[i - 1] + separator + text[i]
else:
result += text[i-1:i+1]
if len(text) % 2 != 0:
result += text[-1]
return result
print(foo("ab", "X"))
print(foo("abba", "X"))
print(foo("abbba", "X"))
print(foo("abbababababbbaaaa", "Z"))
输出:
>> ab
>> abba
>> abbXba
>> abbababababZbbaaZaa
答案 2 :(得分:0)
您可以使用itertools.groupby
:
from itertools import islice, groupby
import math
def solve(strs, n):
for k, g in groupby(strs):
lis = list(g)
it = iter(lis)
yield 'X'.join(''.join(islice(it, n)) for _ in xrange(int(math.ceil(len(lis)/float(n)))))
<强>演示:强>
>>> ''.join(solve("abba", 2))
'abba'
>>> ''.join(solve("abbb", 2))
'abbXb'
>>> ''.join(list(solve('abbbbyyyyy', 2)))
'abbXbbyyXyyXy'
>>> ''.join(solve('abbbbyyyyy', 4))
'abbbbyyyyXy'
答案 3 :(得分:0)
可能好吗?
from itertools import izip_longest
def X(s):
s_odd = s[::2]
s_even = s[1::2]
output = ''
for o, e in izip_longest(s_odd, s_even):
output += o or ''
if o == e:
output += 'X'
output += e or ''
return output
strings = ['ab', 'abba', 'abbb', 'abbba', 'abbababababbbaaaa', 'abcacbbbddbabbdd']
for s in strings:
print X(s)
结果:
ab
abba
abbXb
abbXba
abbababababXbbaaXaa
abcacbbXbdXdbabXbdXd
修改强>
更简单的版本:
def X(s):
output = ''
for i in range(0, len(s), 2):
o = s[i]
e = s[i+1] if i < len(s) - 1 else ''
output += o
if o == e:
output += 'X'
output += e
return output
strings = ['ab', 'abba', 'abbb', 'abbba', 'abbababababbbaaaa', 'abcacbbbddbabbdd']
for s in strings:
print X(s)