leetCode 345. Reverse Vowels of a String 字符串

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，標記位置，進行置換。

代碼如下：

// 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在一起都有反應么？
            }
        }
        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;
    }
};

2016-08-08 10:52:10