/in/foo.cc: In function 'bool dfs(int, int, int, int, int)':
/in/foo.cc:30:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (now == s[g].size()) return true;
      ~~~~^~~~~~~~~~~~~~
/in/foo.cc:33:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^