/in/foo.cc: In function 'void Dijkstra(int)':
/in/foo.cc:109:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int z = 0; z < edge[x.dot].size(); z++)
                         ~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:142:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < strlen(str); i++)
                     ~~^~~~~~~~~~~~~