/in/P4.cpp: In function 'int main()':
/in/P4.cpp:63:23: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (int i = 0; i < result.size(); ++i) {
                     ~~^~~~~~~~~~~~~~~
/in/P4.cpp:65:15: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         if (i != result.size() - 1) cout << "  "; // Print two spaces
             ~~^~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors