C++简单代码/10行：

C++简单代码/10行：

class Solution {
public:
    string ReverseSentence(string s) {
        for(int i = 0; i < s.size() && s[i] == ' ';i ++)
            if (i == s.size() - 1 ) return s;
        stack<string> stk;
        string res,str;
        istringstream ss(s);
        if (s == " ") return res + " ";
        while (ss >> str) stk.push(str), stk.push(" ");
        if (!stk.empty()) stk.pop();
        while (!stk.empty()) res += stk.top(), stk.pop();
        return  res;
    }
};