foo.cc: In function 'int main()':
foo.cc:45:86: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   45 |                                                                 if(y2%4!=0||y2%400!=0&&y2%100==0)
      |                                                                             ~~~~~~~~~^~~~~~~~~~~
foo.cc:52:83: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   52 |                                                                         if(y2%4==0&&y2%100!=0||y2%400==0)
      |                                                                            ~~~~~~~^~~~~~~~~~~

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