foo.cc: In function 'int main()':
foo.cc:14:17: warning: unused variable 'd' [-Wunused-variable]
  int year,month,d;
                 ^
foo.cc: In function 'void PrintMonth(int, int)':
foo.cc:25:26: error: 'm' was not declared in this scope
  m_days=DaysOfMonth(year,m);
                          ^
foo.cc: In function 'int WeekdayOfTheFirsDay(int, int)':
foo.cc:44:6: warning: value computed is not used [-Wunused-value]
   sum+DaysOfYear(y);
   ~~~^~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务