/in/foo.cc: In function 'int main()':
/in/foo.cc:18:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(x>=11&&x-y>=2||y>=11&&y-x>=2)cout<<x<<":"<<y<<endl,x=0,y=0;
      ~~~~~^~~~~~~~
/in/foo.cc:20:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(tx>=21&&tx-ty>=2||ty>=21&&ty-tx>=2)a[j]=tx,b[j]=ty,tx=0,ty=0,j++;
      ~~~~~~^~~~~~~~~~