/in/foo.cc: In function 'void dij(int)':
/in/foo.cc:55:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < got[now].size(); i++)
                    ~~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void gao()':
/in/foo.cc:104:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < g[u].size(); j++)
                            ~~^~~~~~~~~~~~~