/in/foo.cc: In function 'int main()':
/in/foo.cc:16:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(a==11&&a>b&&a-b>=2||b==11&&b>a&&b-a>=2){
      ~~~~~~~~~~^~~~~~~~
/in/foo.cc:21:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   else if(a>=11&&a>b&&a-b>=2||b>=11&&b>a&&b-a>=2){
           ~~~~~~~~~~^~~~~~~~
/in/foo.cc:34:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(a==21&&a>b&&a-b>=2||b==21&&b>a&&b-a>2)
      ~~~~~~~~~~^~~~~~~~
/in/foo.cc:40:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   else if(a>=21&&a>b&&a-b>=2||b>=21&&b>a&&b-a>=2)
           ~~~~~~~~~~^~~~~~~~