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编写一个函数，以字符串作为输入，反转该字符串中的元音字母。
示例 1：
给定 s = "hello", 返回 "holle".
示例 2：
给定 s = "leetcode", 返回 "leotcede".
注意:
元音字母不包括 "y".
详见：https://leetcode.com/problems/reverse-vowels-of-a-string/description/
C++：
class Solution {
public:
string reverseVowels(string s)
{
int left = 0, right= s.size() - 1;
while (left < right)
{
if (isVowel(s[left]) && isVowel(s[right]))
{
swap(s[left++], s[right--]);
}
else if (isVowel(s[left]))
{
--right;
}
else
{
++left;
}
}
return s;
}
bool isVowel(char c)
{
return c == ‘a‘ || c == ‘e‘ || c == ‘i‘ || c == ‘o‘ || c == ‘u‘ || c == ‘A‘ || c == ‘E‘ || c == ‘I‘ || c == ‘O‘ || c == ‘U‘;
}
};
参考：https://www.cnblogs.com/grandyang/p/5426682.html
345 Reverse Vowels of a String 反转字符串中的元音字母
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原文地址：https://www.cnblogs.com/xidian2014/p/8836390.html
