foo.cc: In function ‘int main()’:
foo.cc:16:30: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   16 |                 if(a==11&&a>b&&a-b>=2||b==11&&b>a&&b-a>=2){
      |                    ~~~~~~~~~~^~~~~~~~
foo.cc:21:35: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   21 |                 else if(a>=11&&a>b&&a-b>=2||b>=11&&b>a&&b-a>=2){
      |                         ~~~~~~~~~~^~~~~~~~
foo.cc:31:31: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   31 |                  if(a==21&&a>b&&a-b>=2||b==21&&b>a&&b-a>2){
      |                     ~~~~~~~~~~^~~~~~~~
foo.cc:36:35: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   36 |                 else if(a>=21&&a>b&&a-b>=2||b>=21&&b>a&&b-a>=2){
      |                         ~~~~~~~~~~^~~~~~~~