In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::distance(unsigned int, unsigned int)':
/in/shortestP2P.hpp:81:17: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
           if (A == -1) {
               ~~^~~~~
cc1plus: all warnings being treated as errors