Wrong Answer
/in/foo.cc: In function 'void bfs(int, int)':
/in/foo.cc:16:19: warning: unused variable 'i' [-Wunused-variable]
int x,y,head,tail,i;
^
/in/foo.cc: In function 'void bfs(int, int)':
/in/foo.cc:16:19: warning: unused variable 'i' [-Wunused-variable]
int x,y,head,tail,i;
^
