In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'bool ShortestP2P::isValidGraph(int)':
/in/shortestP2P.hpp:218:5: error: control reaches end of non-void function [-Werror=return-type]
     }
     ^
cc1plus: all warnings being treated as errors