foo.cc: In function 'int main()':
foo.cc:25:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   25 |     if((y1%4==0&&y1%100!=0||y1%400==0)&&d1==30)d1=1,m1++;
      |         ~~~~~~~^~~~~~~~~~~
foo.cc:27:36: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   27 |      if(d1==29&&(y1%4!=0||y1%100==0&&y1%400!=0))d1=1,m1++;
      |                           ~~~~~~~~~^~~~~~~~~~~
foo.cc:39:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   39 |    if(y1%4!=0||y1%100==0&&y1%400!=0)i+=28;
      |                ~~~~~~~~~^~~~~~~~~~~
foo.cc:47:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   47 |   if(y%4!=0||y%100==0&&y%400!=0)i+=365;
      |              ~~~~~~~~^~~~~~~~~~

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