/in/foo.cc: In function 'int bfs()':
/in/foo.cc:47:1: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
 if(next.x==ex && next.y==ey)return next.step; next.step;
 ^~
/in/foo.cc:47:47: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
 if(next.x==ex && next.y==ey)return next.step; next.step;
                                               ^~~~
/in/foo.cc:47:52: warning: statement has no effect [-Wunused-value]
 if(next.x==ex && next.y==ey)return next.step; next.step;
                                               ~~~~~^~~~