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[已解决]小白求助课后习题,字符串相关,做了一天没做出来

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发表于 2021-8-31 17:31:07 | 显示全部楼层 |阅读模式

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本帖最后由 liyidong3000 于 2021-9-1 11:03 编辑

请用已学过的知识编写程序,找出小甲鱼藏在下边这个长字符串中的密码,密码的埋藏点符合以下规律:
    a) 每位密码为单个小写字母
    b) 每位密码的左右两边均有且只有三个大写字母

这是小甲鱼的答案,算法比较复杂。
str1 = '''ABSaDKSbRIHcRHGcdDIF'''

countA = 0  # 统计前边的大写字母
countB = 0  # 统计小写字母
countC = 0  # 统计后边的大写字母
length = len(str1)

for i in range(length):
    if str1[i] == '\n':
        continue

    """
    |如果str1[i]是大写字母:
    |-- 如果已经出现小写字母:
    |-- -- 统计后边的大写字母
    |-- 如果未出现小写字母:
    |-- -- 清空后边大写字母的统计
    |-- -- 统计前边的大写字母
    """
    if str1[i].isupper():
        if countB:
            countC += 1
        else:
            countC = 0
            countA += 1

    """
    |如果str1[i]是小写字母:
    |-- 如果小写字母前边不是三个大写字母(不符合条件):
    |-- -- 清空所有记录,重新统计
    |-- 如果小写字母前边是三个大写字母(符合条件):
    |-- -- 如果已经存在小写字母:
    |-- -- -- 清空所有记录,重新统计(出现两个小写字母)
    |-- -- 如果该小写字母是唯一的:
    |-- -- -- countB记录出现小写字母,准备开始统计countC
    """
    if str1[i].islower():
        if countA != 3:
            countA = 0
            countB = 0
            countC = 0
        else: 
            if countB:
                countA = 0
                countB = 0
                countC = 0
            else:
                countB = 1
                countC = 0
                target = i

    """
    |如果前边和后边都是三个大写字母:
    |-- 如果后边第四个字母也是大写字母(不符合条件):
    |-- -- 清空记录B和C,重新统计
    |-- 如果后边仅有三个大写字母(符合所有条件):
    |-- -- 打印结果,并清空所有记录,进入下一轮统计
    """
    if countA == 3 and countC == 3:
        if i+1 != length and str1[i+1].isupper():
            countB = 0
            countC = 0
        else:
            print(str1[target], end='')
            countA = 3
            countB = 0
            countC = 0

我自己写了一个
string='''ABSaDKSbRIHcRHGcdDIF'''
length=len(string)
list1=[]
for i in range(length):
    if string[i] == '\n':
        continue
    if string[i].islower() and string[i-3:i].isupper() and string[i+1:i+4].isupper() and string[i-4:i].isupper() == 0 and string[i+1:i+5].isupper() == 0:
        list1.append(string[i])
print(list1)

感觉逻辑没问题,但是运行结果跟小甲鱼的答案不同。

字符编码这个简短的是没问题的。题目原始编码为
ACFlCTLIQlAIVMTqHFkswqbDDHtpgcWaXSSglUYKE
lqNsYCyaQXBzrFUbkAUAWAKrDgDtAlGMBqWQhpEwquZqWZJpslUfMllCwWptqINjrOBTLuPzwvXNbLCx
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qKWGc
最佳答案
2021-9-1 17:00:57
你这个程序的问题出在字符串里的回车上。字符串里有大量的'\n',当'\n'前面的字符为2个大写字母时,str[i-3:i].isupper()会为True,就是把'\n'也算为大写字母了
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
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 楼主| 发表于 2021-9-1 10:59:43 | 显示全部楼层
自己顶一下,大家帮忙看看是不是语句逻辑不通啊
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
回复 支持 反对

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发表于 2021-9-1 15:28:21 | 显示全部楼层

回帖奖励 +2 鱼币

666
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
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 楼主| 发表于 2021-9-1 15:39:08 | 显示全部楼层

不要光6呀,帮我看看问题呢
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
回复 支持 反对

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发表于 2021-9-1 17:00:57 | 显示全部楼层    本楼为最佳答案   
你这个程序的问题出在字符串里的回车上。字符串里有大量的'\n',当'\n'前面的字符为2个大写字母时,str[i-3:i].isupper()会为True,就是把'\n'也算为大写字母了
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
回复 支持 反对

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 楼主| 发表于 2021-9-1 22:32:37 From FishC Mobile | 显示全部楼层
好的,非常感谢我再来试试
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
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发表于 2021-9-2 08:42:34 | 显示全部楼层
liyidong3000 发表于 2021-9-1 15:39
不要光6呀,帮我看看问题呢

哈哈我是混鱼币的
想知道小甲鱼最近在做啥?请访问 -> ilovefishc.com
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