Given a string, you need to reverse the order of characters in each word within a sentence while

still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"

Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

思路：

用一个vector<vector<char> >收集所有的字符，空格为单词分割符，将每一个单词翻转后，输出即可。

感觉思路还比较朴素，但是看上去很啰嗦。

string reverseWords(string s){    if(s == "")return s;    vector
     
      
        >sentence;    vector
       
        word;    int i=0;    while(s[i] != '\0')    {        if(s[i]!=' ')        {            word.insert(word.begin(),s[i]);        }        else        {            sentence.push_back(word);            word.clear();        }        i++;    }    sentence.push_back(word);    char res[100000];//太小 要用100000    int ind =0;    for(int i=0;i