题解 | #今年的第几天？#

#include <iostream>
using namespace std;
const int daytab[2][13]=
{
    {0,31,28,31,30,31,30,31,31,30,31,30,31},
    {0,31,29,31,30,31,30,31,31,30,31,30,31}
};
int isLeapYear(int year)
{
    if((year%4==0&&year%100!=0)||year%400==0)return 1;
    else return 0;
}
int main() {
    int year, month,day;
    //for(int i=0;i<=12;i++)cout<<daytab[0][i]<<" ";
    //cout<<endl;
    while (cin >> year >> month>>day) { // 注意 while 处理多个 case
        int index=isLeapYear(year);
        int sum=0;
        for(int i=0;i<month;i++)
        {
            //cout<<"test"<<endl;
            sum+=daytab[index][i];
            //cout<<sum<<endl;
        }
        sum+=day;
        cout<<sum<<endl;
    }
}
// 64 位输出请用 printf("%lld")