/in/foo.cc: In function 'int IsLeapYear(int)':
/in/foo.cc:9:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(year%400==0||year%4==0&&year%100!=0)
                  ~~~~~~~~~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:46:12: warning: unused variable 'n' [-Wunused-variable]
  int sum=0,n=0;
            ^