foo.cc: In function 'int main()':
foo.cc:10:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |                 if(i%4==0&&i%100!=0||i%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:15:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   15 |         if(y%4==0&&y%100!=0||y%400==0)
      |            ~~~~~~^~~~~~~~~~
foo.cc:30:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   30 |                 if(i%4==0&&i%100!=0||i%400==0)
      |                    ~~~~~~^~~~~~~~~~
foo.cc:35:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   35 |         if(y1%4==0&&y1%100!=0||y1%400==0)
      |            ~~~~~~~^~~~~~~~~~~

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