/in/foo.cc: In member function 'bool xpy::operator<(const xpy&) const':
/in/foo.cc:9:41: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 return yw>y.yw||yw==y.yw&&sx>y.sx;
      |                                 ~~~~~~~~^~~~~~~~~