题解 | #打印日期#

#include <array>
#include <iostream>
using namespace std;
// 获取当月的天数
int GetMonthDay(int year,int month)
{
    std::array<int, 13>monthday = {0,31,28,31,30,31,30,31,31,30,31,30,31};
    if(month == 2 && ((year %4 == 0 && year % 100 !=0) || year % 400 ==0))
    {
        return 29;
    }
    return monthday[month];     
}
int main()
{
    int year = 0;
    int yeardays = 0;

    while(cin>>year>>yeardays)
    {
        int curmonth;
        int curday;
        // 月份从一月开始往后走
        int month = 1;
        while(yeardays > GetMonthDay(year,month))
        {
            yeardays = yeardays - GetMonthDay(year, month);
            month++;
        }
        if(month <10 && yeardays < 10)
        {
            cout<<year<<'-'<<0<<month<<"-"<<0<<yeardays<<endl;
        }
        else if(month <10 && yeardays >= 10)
        {
            cout<<year<<'-'<<0<<month<<"-"<<yeardays<<endl;
        }
        else if(month >=10 && yeardays < 10)
        {
            cout<<year<<'-'<<month<<"-"<<0<<yeardays<<endl;
        }
        else 
        {
            cout<<year<<'-'<<month<<"-"<<yeardays<<endl;
        }
    }

}