/in/foo.cc: In function 'std::pair<char, bool> radixAddChar(int, std::vector<char>)':
/in/foo.cc:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < chs.size(); i++) {
                     ~~^~~~~~~~~~~~
/in/foo.cc: In function 'std::__cxx11::string radixAdd(const string&, const string&, int)':
/in/foo.cc:90:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i <= maxN; i++) {
                     ~~^~~~~~~