/in/foo.cc: In function 'int main()':
/in/foo.cc:8:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    8 |         if(y%4==0&&y%100!=0||y%400==0)
      |            ~~~~~~^~~~~~~~~~
/in/foo.cc:25:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   25 |                 else if(d>30&&m==4||m==6||m==9||m==11)
      |                         ~~~~^~~~~~
/in/foo.cc:30:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   30 |                 else if(d>31&&m==1||m==3||m==5||m==7||m==8||m==10||m==12)
      |                         ~~~~^~~~~~