In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.hpp:49:26: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for(int i = 0; i < V; ++i){
                        ~~^~~
/in/shortestP2P.hpp:50:28: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
           for(int x = 0; x < V; ++x){
                          ~~^~~
/in/shortestP2P.hpp:52:32: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
               for(int y = 0; y < V; ++y){
                              ~~^~~
cc1plus: all warnings being treated as errors