题解 | #今年的第几天？#

#include<cstdio>

using namespace std;

int dayTable[2][13]= {
	{0,31,28,31,30,31,30,31,31,30,31,30,31},    //平年每月天数
	{0,31,29,31,30,31,30,31,31,30,31,30,31}     //闰年每月天数
};

//定义函数判断是否为闰年
bool IsLeapYear(int year){
	if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0){
		return true;
	}
	return false;
}

int main(){
	int year,month,day;
	while(scanf("%d%d%d",&year,&month,&day) != EOF){
		int number = 0;   //定义变量，保存天数
		int row = IsLeapYear(year);   //返回true等价于返回1,dayTable[1]对应于闰年中的每月天数，返回false等价于返回0
		for(int i = 0; i < month; ++i){   //进行天数的累加即可
			number += dayTable[row][i];
		}
		number += day;
		printf("%d\n",number);
	}
	return 0;
}