代码及思路详解 

#include <iostream>
using namespace std;
int func(int n)
{
	int sum=0; 
	while(n)
	{
		sum+=n%10;
		n/=10;//d得到每一位的数 
	}
	return sum;
}
int main()
{
  int count=0;
  int year,month,days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
  for(year=1900;year<=9999;year++)
  {
  	if(year%4==0&&year&100!=0||year%400==0)
  	days[2]=29;
  	for(int i=1;i<=12;i++)
  	{
  		for(int j=1;j<=days[j];j++)
  		if(func(year)==func(j)+func(i))
		  count++; //将该月的每一天都比较一遍 
	  }
  }
  cout<<count;
  return 0;
}