foo.cc: In function 'int main()':
foo.cc:9:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |   if(r1==32&&y1==1||y1==3||y1==5||y1==7||y1==8||y1==10||y1==12){
      |      ~~~~~~^~~~~~~
foo.cc:12:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   12 |   if(r1==31&&y1==4||y1==6||y1==9||y1==11){
      |      ~~~~~~^~~~~~~
foo.cc:15:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   15 |   if(y1==2&&n1%4==0&&n1%100!=0||n1%400==0){
      |      ~~~~~~~~~~~~~~^~~~~~~~~~~

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