/in/foo.c: In function 'main':
/in/foo.c:30:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
             if(w==11||l==11&&abs(w-l)>=2)
                       ~~~~~^~~~~~~~~~~~~
/in/foo.c:56:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
             if(l==21||w==21&&abs(w-l)>=2)
                       ~~~~~^~~~~~~~~~~~~