/in/foo.cc:7:8: error: stray '\357' in program
  head=0；tail=1;
        ^
/in/foo.cc:7:9: error: stray '\274' in program
  head=0；tail=1;
         ^
/in/foo.cc:7:10: error: stray '\233' in program
  head=0；tail=1;
          ^
/in/foo.cc: In function 'int bfs(int, int)':
/in/foo.cc:7:11: error: expected ';' before 'tail'
  head=0；tail=1;
           ^~~~
/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]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:34:9: error: 'dfs' was not declared in this scope
  dfs(1,1);
         ^