7-59 翻转单词顺序 (20 分)

#include<iostream>
#include<vector>
#include<sstream>
#include<stack>
using namespace std;
int main() 
{
    string s;
    vector<string>v;
    stack<string>st;
    while (getline(cin,s))
    {
        stringstream t(s);
        while (t >> s) v.push_back(s);
        for (int i = v.size() - 1; i >= 0; i--)
        {
            if (i != v.size() - 1) cout << ' ';
            cout << v[i];
        }
        cout << endl;
        v.clear();
    }
    return 0;
}