foo.cc: In function ‘void dfs(int, int)’:
foo.cc:15:44: warning: the address of ‘bush’ will never be NULL [-Waddress]
   15 |                 if(x<1&&x>n&&y<1&&y>m||bush!=0)
      |                                        ~~~~^~~
foo.cc:3:15: note: ‘bush’ declared here
    3 | int ans,n,m,t,bush[15][15],dir[8][2]={{-2,1},{-2,-1},{2-1},{2,1},{1,-2},{1,2},{-1,-2},{-1,-2}};
      |               ^~~~
foo.cc:15:33: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   15 |                 if(x<1&&x>n&&y<1&&y>m||bush!=0)
      |                    ~~~~~~~~~~~~~^~~~~