In file included from /in/driver/main.cpp:1:0:
/in/shortestP2P.hpp: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.hpp:45:29: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
           for (int i = 0; i < E; i++) {
                           ~~^~~
/in/shortestP2P.hpp:50:29: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
           for (int k = 0; k < V; k++) {//e.g. when V = 4, need A1-A4, A0 is the initial matrix
                           ~~^~~
/in/shortestP2P.hpp: In member function 'void ShortestP2P::distance(unsigned int, unsigned int)':
/in/shortestP2P.hpp:64:17: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
           if (A == -1) {
               ~~^~~~~
/in/shortestP2P.hpp: In member function 'void ShortestP2P::init_helper()':
/in/shortestP2P.hpp:79:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for (int i = 0; i < V; i++) {
                         ~~^~~
/in/shortestP2P.hpp:81:31: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
             for (int j = 0; j < V; j++) {
                             ~~^~~
/in/shortestP2P.hpp: In member function 'void ShortestP2P::update_helper(int)':
/in/shortestP2P.hpp:96:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
         for (int i = 0; i < V; i++) {
                         ~~^~~
/in/shortestP2P.hpp:98:31: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
             for (int j = 0; j < V; j++) {
                             ~~^~~
cc1plus: all warnings being treated as errors