reverse vowels Algorithm
(that is, a closed variant of ⟨ɛ⟩, much as the high-mid vowel letter ⟨ɵ⟩ is a closed variant of ⟨e⟩), and this variant made its manner into Unicode as U+029A ʚ LATIN small letter close open E.The IPA charts were later changed to the current closed reversed epsilon ⟨ɞ⟩, and this was adopted into Unicode as U+025E ɞ LATIN small letter CLOSED reverse open E.
/*
* 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".
*/
#include <iostream>
#include <algorithm>
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');
}
std::string reverseVowels(std::string s)
{
if (s.length() == 0)
{
return s;
}
unsigned int i = 0;
unsigned int j = s.length() - 1;
while (i < j)
{
while (i < j && !isVowel(s[i]))
{
i++;
}
while (i < j && !isVowel(s[j]))
{
j--;
}
if (i < j)
{
std::swap(s[i], s[j]);
++i;
--j;
}
}
return s;
}
int main()
{
std::string str;
std::cout << "Please enter input string: ";
std::cin >> str;
std::cout << "Expected output string: " << reverseVowels(str) << std::endl;
return 0;
}
