foo.cc: In function 'bool cmp(st, st)':
foo.cc:13:45: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   13 |         return a.zf()>b.zf()||a.zf()==b.zf()&&a.yw>b.yw||
      |                               ~~~~~~~~~~~~~~^~~~~~~~~~~
foo.cc:14:35: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   14 |         a.zf()==b.zf()&&a.yw==b.yw&&a.xh<b.xh;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~

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