345. 反转字符串中的元音字母

Posted 2022-08-11 wuyi_all_in

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:

输入: "hello"
输出: "holle"
示例 2:

输入: "leetcode"
输出: "leotcede"

---

class Solution 
public:
  bool check_vowel(char a)
  
    return((a == e) || (a == a) || (a == i) || (a == o) || (a == u));
  
 
 
  string reverseVowels(string s) 
    int n = s.size();
    int l = 0, r = n - 1;
    while (l < r)
    
      while (check_vowel(tolower(s[l])) == false&&l<r)l++;
      while (check_vowel(tolower(s[r])) == false&&l<r)r--;
      
      swap(s[l++], s[r--]);
    
    return s;
 
  
;

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tolower 将大写字母转化成小写字母