大神!!求用python写一个程序,找出给定字符串s中按字母表顺序排列的最...

发布网友发布时间：2022-04-23 16:38

共3个回答

热心网友时间：2022-04-18 07:09

from string import lowercase

s = 'babcbcasdfweljlkjlefghisfsdfsd'

cont = []
sub = []
for i in s:
    if len(sub) >= 1 and lowercase.index(sub[-1]) + 1 != lowercase.index(i):
            cont.append(''.join(sub))
            sub = []
    sub.append(i)

cont = sorted(cont, key = len, reverse=True)
print cont[0]

望采纳！

http://www.pythoner.cn/labs/在线运行连python内置函数都用不了，还是不要在这上面学习了，自己本地安装一个python环境也不费劲。

热心网友时间：2022-04-18 08:27

import re
def fun(s):
    r = r'a?b?c?d?e?f?g?h?i?j?k?l?m?n?o?p?q?r?s?t?u?v?w?x?y?z?'
    m = re.findall(r, s, re.I)
    m = sorted(m, key = len, reverse=True)
    return m[0]
print(fun('abcbcd'))

热心网友时间：2022-04-18 10:02

p = 0
ans = ''
while True :
    ans1 = ''
    com = ''
    for i in (s[p:]):
        if str(i) > str(com):
            com = i
            ans1 = ans1 + i
        else:
            p = p + 1
            break
    if len(ans)< len(ans1):
        ans = ans1
    elif p+1 == len(s):
        break
print('Longest substring in alphabetical order is:'+ str(ans))