/in/foo.cc: In function 'int main()':
/in/foo.cc:27:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(n>=11||m>=11&&abs(n-m)>=2)
             ~~~~~^~~~~~~~~~~~~
/in/foo.cc:32:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(nn[l]>=21||mm[l]>=21&&abs(nn[l]-mm[l])>=2)
                 ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~