leetcode-5.27[541. 反轉字符串 II、345. 反轉字符串中的元音字母、557. 反轉字符串中的單詞 III]（python實現)

題目1

題解1

class Solution:
    def reverseStr(self, s: str, k: int) -> str:
        res=''
        for i in range(0,len(s),2*k):
            res+=s[i:i+k][::-1]+s[i+k:i+2*k]
        return res

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題目2

題解2

class Solution:
    def reverseVowels(self, s: str) -> str:
        """
            雙指針法
        """
        Vowels = ['a','e','i','o','u','A','E','I','O','U']
        s = list(s)
        l, r = 0 ,len(s) - 1
        while l < r:
            if s[l] in Vowels and s[r] in Vowels:
                s[l],s[r] = s[r],s[l]
                l += 1
                r -= 1
            elif s[l] in Vowels:
                r -= 1
            elif s[r] in Vowels:
                l += 1
            else:
                l += 1
                r -= 1
        return ''.join(s)

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題目3

題解3

class Solution:
    def reverseWords(self, s: str) -> str:
        s_split = s.split()
        for i,v in enumerate(s_split):
            s_split[i] = v[::-1]
        return ' '.join(s_split)

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