/in/foo.cc: In function 'int bfs()':
/in/foo.cc:36:16: warning: unused variable 't1' [-Wunused-variable]
  int head,tail,t1;
                ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:79:29: error: 'sizef' was not declared in this scope
   memset(final,0,sizef(final));
                             ^