foo.cc: In function 'int WeekdayOfTheFirstDay(int, int)':
foo.cc:11:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   11 |   if(i%400==0 || i%4==0 && i%100!=0)
      |                  ~~~~~~~^~~~~~~~~~~
foo.cc:31:32: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   31 |    if(year%400==0 || year%4==0 && year%100!=0)
      |                      ~~~~~~~~~~^~~~~~~~~~~~~~
foo.cc: In function 'void daying(int, int)':
foo.cc:54:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   54 |   if(year%400==0||year%4==0&&year%100!=0)
      |                   ~~~~~~~~~^~~~~~~~~~~~~

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