C++ Save string line by line to a file as fast as possible

I was trying to write to a file or save the string s.substr (space_pos) in a vector as fast as possible. I tried to write it to a file with ofstream or to output it with cout but it takes a long time. The size of the text file is 130mb.

This is the code:

fstream f(legitfiles.c_str(), fstream::in );
string s;
while(getline(f, s)){
    size_t space_pos = s.rfind(" ") + 1;

    cout << s.substr(space_pos) << endl;
    ofstream results("results.c_str()");
    results << s.substr(space_pos) << endl;
    results.close();

}
cout << s << endl;
f.close();

Is there a way to write or print the string in a faster way?