Write a function that takes a string as input and reverse only the vowels of a string.python
Example 1:
Given s = "hello", return "holle".segmentfault
Example 2:
Given s = "leetcode", return "leotcede".函数
Note:
The vowels does not include the letter "y".指针
class Solution {
public:
string reverseVowels(string s) {
int i=0,j=s.size()-1;
while(i<j){
while(!isaeiou(s[i])) ++i;
while(!isaeiou(s[j])) --j;
if(i>=j) break;
swap(s[i++],s[j--]);
}
return s;
}
private:
bool isaeiou(char c){
return c=='a'||c=='e'||c=='i'||c=='o'||c=='u'||c=='A'||c=='E'||c=='I'||c=='O'||c=='U';
}
};
思路和第344题一致, 忽略掉非aeiou的元素便可, 实现方式也是采用双指针, 借鉴于leetcode 344中优秀答案. 只不过本身写的这个判断是否为aeiou的函数有点丑...仍是须要专门学一下C++语法+STL之类的,脑海中只会python的dict或者set方案...code