/**

*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".

*/

class Solution {

public:

string reverseVowels(string s) {

string str(s);

int len = s.size();

if(len == 0)

return s;

int start = 0;

int last = len - 1;

while(start < last)

{

while(start < last && !isVowels(s[start]))

start++;

while(start < last && !isVowels(s[last]))

last--;

char temp = str[start];

str[start] = str[last];

str[last] = temp;

start++;

last--;

}

return str;

}

bool isVowels(char c)

{

if(c == 'a' || c=='o' ||c == 'e' || c == 'i' || c== 'u'|| c == 'A' || c == 'O' || c == 'E' || c == 'U' || c == 'I')

return true;

else

return false;

}

};