/in/foo.cc: In function 'int Floyd(MGraph, int, int)':
/in/foo.cc:16:21: warning: variable 'path' set but not used [-Wunused-but-set-variable]
  int A[MAXV][MAXV], path[MAXV][MAXV];
                     ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:70:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0; j < ss.size(); j++)
                  ~~^~~~~~~~~~~