/in/foo.cc: In function 'int main()':
/in/foo.cc:7:6: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(n>=-1&n<=1&m>=-1&n<=1)
     ~^~~~
/in/foo.cc:7:17: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(n>=-1&n<=1&m>=-1&n<=1)
                ~^~~~
/in/foo.cc:7:23: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
  if(n>=-1&n<=1&m>=-1&n<=1)
                      ~^~~