In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.hpp:114:21: error: conversion to 'int' from 'size_t {aka long unsigned int}' may alter its value [-Werror=conversion]
             tarjan(i);
                     ^
cc1plus: all warnings being treated as errors