/in/foo.cc: In function 'int dfs(ci)':
/in/foo.cc:91:9: warning: 'hsu' may be used uninitialized in this function [-Wmaybe-uninitialized]
   hsn[u]=hsu;
   ~~~~~~^~~~
/in/foo.cc:91:9: warning: 'hsu' may be used uninitialized in this function [-Wmaybe-uninitialized]
   hsn[u]=hsu;
   ~~~~~~^~~~
/in/foo.cc: In function 'void dfsrt(ci)':
/in/foo.cc:102:8: warning: 'hsu' may be used uninitialized in this function [-Wmaybe-uninitialized]
  hsn[u]=hsu;
  ~~~~~~^~~~