In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.hpp:62:22: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
             if (from >= vertices || to >= vertices) {
                 ~~~~~^~~~~~~~~~~
/in/shortestP2P.hpp:62:40: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
             if (from >= vertices || to >= vertices) {
                                     ~~~^~~~~~~~~~~
cc1plus: all warnings being treated as errors