In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.hpp:84:20: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
  for (int i = 0; i < x; i++) {
                  ~~^~~
cc1plus: all warnings being treated as errors