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更新时间：2021-08-04 00:28:40
345. Reverse Vowels of a String
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".
思路：
找到元音字母，标记位置，进行置换。
代码如下：
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// vowels(元音字母)包括：a,e,i,o,u. class Solution {
public:
bool isVowels(char c)
{
char vowels[10] = {'a','e','i','o','u','A','E','I','O','U'};
for(int i = 0; i < 10; i++)
{
if(c == vowels[i])
{
return true;
break;//return 和 break在一起都有反应么？
}
}
return false;
}
string reverseVowels(string s) {
vector<int> recordIndex;
vector<char > str;
for(int i = 0;i<s.size();i++)
{
str.push_back(s.at(i));
}
for(int i = 0; i < str.size() ; i++)
{
if( isVowels(str[i]) )
{
recordIndex.push_back(i);
}
}
for(int i = 0 ; i < recordIndex.size() / 2 ; i++)
{
char left = str[recordIndex[i]];
char right = str[recordIndex[recordIndex.size() - 1 - i]];
str[recordIndex[i]] = right;
str[recordIndex[recordIndex.size() - 1 - i]] = left;
}
s = "";
for(int i = 0 ; i < str.size() ; i++)
{
s.append(1,str[i]);
}
return s;
}
};
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