翻转字符串里面的单词

#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

string reverseWords(string s);
int main()
{
    string s;
    getline(cin,s);
    cout << reverseWords(s);
    return 0;
}

string reverseWords(string s) {
    s += ‘ ‘;
    vector<string> stack;
    string tmp;
    bool if_push = true;
    for (int i = 0; i < s.size(); ++i)
    {
        if (s[i] == ‘ ‘)
        {
            if (!if_push)
            {
                stack.push_back(tmp);
                tmp.clear();
                if_push = true;
            }
        }
        else
        {
            tmp += s[i];
            if_push = false;
        }
    }
    
    for (int i = stack.size() - 1; i > 0; --i)
    {
        tmp += stack[i];
        tmp += ‘ ‘;
    }
    if (!stack.empty())
    {
        tmp += stack[0];
    }
    return tmp;
}