LeetCode:Reverse Words in a String

题目链接

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

---

class Solution {
public:
    void reverseWords(string &s) 
    {
        //从前往后扫描 
        string res, word;
        for(int i = s.size()-1; i >= 0;)
        {
            while(i >= 0 && s[i] == ' ')--i;//去掉空格
            if(i < 0)break;
            if(res.size() != 0)res.push_back(' ');
            word.clear();
            while(i >= 0 && s[i] != ' ')word.push_back(s[i--]);//word为找到的一个单词
            for(int j = word.size()-1; j >= 0; --j)
                res.push_back(word[j]);
        }
        s = res;
    }
};

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