/in/foo.cc: In function 'int main()':
/in/foo.cc:9:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(s%4==0&&s%100!=0||s%400==0) 
      ~~~~~~^~~~~~~~~~
/in/foo.cc:16:13: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if(y%4==0&&y%100!=0||y%400==0)
       ~~~~~~^~~~~~~~~~
/in/foo.cc:40:10: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
   else if(m==1||m==3||m==5||m==7||m==8||m==10||12==0)
          ^