今天是今年第几天

#include
#define ISYEAP(x) x%100!=0 && x%4==0 ||x%400==0 ?1 :0
int DayOfMonth[13][2]={
	0,0,
	31,31,//1
	28,29,//2
	31,31,//3
	30,30,//4
	31,31,//5
	30,30,//6
	31,31,//7
	31,31,//8
	30,30,//9
	31,31,//10
	30,30,//11
	31,31 //12
};
void nextDay(int &year,int &month,int &day){
	++day;
	if(day>DayOfMonth[month][ISYEAP(year)]){
		day=1;
		++month;
		if(month>12){
		   ++year;
		   month=1;	
		}	   
	}
}
int buf[3001][13][32];
int main(){
	int year=0,month=1,day=1;
    int cnt=0;//计算天数保存起来
	while(year!=3001){
		buf[year][month][day]=cnt;
		nextDay(year,month,day);
		cnt++;
	} 
	int Y,M,D;
	while(~scanf("%d%d%d",&Y,&M,&D)){
	     printf("%d\n",buf[Y][M][D]-buf[Y][1][1]+1);
	}
	return 0;
}
/*
1990 9 20
2000 5 1
样例输出：

263
122
*/