1
class Solution {
2
 public:
3
  bool isVowel(char s) {
4
    if (s == 'a' or s == 'e' or s == 'i' or s == 'o' or s == 'u' or s == 'A' or s == 'E' or
5
        s == 'I' or s == 'O' or s == 'U')
6
      return true;
7
    return false;
8
  }
9

10
  string reverseVowels(string s) {
11
    if (s.size() == 0) return "";
12
    int left = 0, right = s.size() - 1;
13

14
    while (left < right) {
15
      if (isVowel(s[left]) and isVowel(s[right])) {
16
        swap(s[left], s[right]);
17
        left++;
18
        right--;
19
      } else if (isVowel(s[left]))
20
        right--;
21
      else if (isVowel(s[right]))
22
        left++;
23
      else {
24
        left++;
25
        right--;
26
      }
27
    }
28

29
    return s;
30
  }
31
};