/in/foo.cc: In function 'bool pd(int, int)':
/in/foo.cc:21:43: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(n%400==0||(n%4==0&&n%100!=0)&&day<=29&&m==2)return 1;
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:27:6: warning: unused variable 'k' [-Wunused-variable]
  int k=0;
      ^