題目描述：

Write a function that takes a string as input and reverse only the vowels of a string.

Example 1:
Given s = "hello", return "holle".

Example 2:
Given s = "leetcode", return "leotcede".

Note:
The vowels does not include the letter "y".

解題思路：

設置兩個指針，分別從前往后與從后往前移動

代碼如下：

class Solution(object):def reverseVowels(self, s):""":type s: str:rtype: str"""vowels = set(list('aeiouAEIOU'))s = list(s)start = 0end = len(s) - 1while start <= end:if s[start] in vowels and s[end] in vowels :s[start], s[end] = s[end], s[start]start += 1end -= 1else:if s[start] not in vowels:start += 1if s[end] not in vowels:end -= 1return ''.join(s)

　　

轉載于:https://www.cnblogs.com/zihaowang/p/5716755.html

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