foo.cc: In function 'int IsLeapYear(int)':
foo.cc:7:15: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if (year%4==0&&year%100!=0||year%400==0)
      ~~~~~~~~~^~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:83:10: warning: unused variable 'd' [-Wunused-variable]
  int y,m,d;
          ^

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