一、题目

二、代码

#include <iostream>
using namespace std;
class Date {
  public:

    Date(int year = 0, int month = 0, int day = 0) {
        _year = year;
        _month = month;
        _day = day;
    }
    Date(const Date& _d);
    int GetDay(int year, int month);
    Date& operator+=(int d);
    Date operator+(int d);
  public:
    int _year;
    int _month;
    int _day;

};


Date:: Date(const Date& _d) {
    _year = _d._year;
    _month = _d._month;
    _day = _d._day;
}
int Date::GetDay(int year, int month) {
    static int a[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
    if (month == 2) { //某年是闰年的时候，2月为29
        if ((_year % 4 == 0 && _year % 100 != 0) || _year % 400 == 0) {
            return 29;
        }
    }

    return a[month];
}

Date& Date::operator+=(int d) {
    _day = d + _day;
    while (_day > GetDay(_year, _month)) {
        _day -= GetDay(_year, _month);
        ++_month;

        if (_month == 13) {
            ++_year;
            _month = 1;
        }
    }
    return *this;
}

Date Date:: operator+(int d) {
    Date tmp(*this);
    tmp += d;
    return tmp;
}


int main() {
    int y, m, d, n, total;
    cin >> total;
    while (total--) {
        cin >> y >> m >> d >> n;
        Date date(y, m, d);
        Date t = date + n;
        printf("%04d-%02d-%02d\n", t._year, t._month, t._day);
    }
}