/in/foo.cc: In member function 'bool xpy::operator<(xpy)':
/in/foo.cc:9:53: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 return this->yw>y.yw||this->yw==y.yw&&this->sx>y.sx;
      |                                       ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~