In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.hpp:62:28: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for(long int i=0; i<valid.size(); i++)
                           ~^~~~~~~~~~~~~
/in/shortestP2P.hpp:63:30: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
           for(long int j=0; j<valid.size(); j++)
                             ~^~~~~~~~~~~~~
/in/shortestP2P.hpp:67:26: error: conversion to 'int' from 'long int' may alter its value [-Werror=conversion]
               int oldj = j;
                          ^
/in/shortestP2P.hpp:71:36: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
                 for(long int k=0; k<valid.size(); k++)
                                   ~^~~~~~~~~~~~~
cc1plus: all warnings being treated as errors