/in/foo.cc: In function 'int bfs(int, int)':
/in/foo.cc:18:37: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
       if(!a[tx][ty]&&tx<11&&tx>0&&ty<11&ty>0)
                                   ~~^~~
/in/foo.cc:27:1: warning: no return statement in function returning non-void [-Wreturn-type]
 } 
 ^