/in/foo.cc: In function 'int main()':
/in/foo.cc:10:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |                 if(n%4==0&&n%100!=0||n%400==0)
      |                    ~~~~~~^~~~~~~~~~
/in/foo.cc:6:17: warning: unused variable 'n' [-Wunused-variable]
    6 |         int a,d,n,cnt=0;
      |                 ^