/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:7:6: warning: unused variable 'mx' [-Wunused-variable]
  int mx=-1,md=0,deg=0;f[p]=0;
      ^~
/in/foo.cc:7:12: warning: unused variable 'md' [-Wunused-variable]
  int mx=-1,md=0,deg=0;f[p]=0;
            ^~
/in/foo.cc:7:17: warning: unused variable 'deg' [-Wunused-variable]
  int mx=-1,md=0,deg=0;f[p]=0;
                 ^~~