/in/foo.cc: In function 'bool cmp1(stu, stu)':
/in/foo.cc:17:53: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   17 |         return x.sum1()>y.sum1()||x.sum1()==y.sum1()&&x.sum2()>y.sum2()||x.sum1()==y.sum1()&&x.sum2()==y.sum2()&&x.max1()>y.max1();
      |                                   ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:17:112: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   17 |         return x.sum1()>y.sum1()||x.sum1()==y.sum1()&&x.sum2()>y.sum2()||x.sum1()==y.sum1()&&x.sum2()==y.sum2()&&x.max1()>y.max1();
      |                                                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~