foo.cc: In function 'void checkmonthday(ll&)':
foo.cc:130:51: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  130 |                 if(start.month>10||start.month==10&&start.day>4)start.day+=10;
      |                                    ~~~~~~~~~~~~~~~^~~~~~~~~~~~~
foo.cc:170:54: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  170 |                 if(start.year%400==0||start.year%4==0&&start.year%100!=0)//现在的闰年判断
      |                                       ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

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