题解 | 打印日期

#include <iostream>
#include <iomanip>
using namespace std;

class Date{
public:
    Date(int year,int month=1,int day=1)
    {
        _year=year;
        _month=month;
        _day=day;
    }
    int GetMonthDay()
    {
        int monthdays[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
        if((_year%4==0&&_year%100!=0)||_year%400==0)
        {
            if(_month==2)
            {
                return 29;
            }
        }
        return monthdays[_month];
    }

    void ddd(int b)
    {
        while(b>GetMonthDay())
        {
            b-=GetMonthDay();
            _month++;
            if(_month>12)
            {
                _month=1;
                ++_year;
            }
        }
        _day=b;
    }

    void Print()
    {
        printf("%04d-%02d-%02d\n", _year, _month, _day);
    }
private:
    int _year;
    int _month;
    int _day;
};

int main() {
    int a,b;
    while(scanf("%d %d",&a,&b)!=EOF)
    {
        Date d(a);
        d.ddd(b);
        d.Print();
    }

    return 0;
}