题解 | #日期差值#

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

class Date {
public:
    // 判断是否为闰年
    bool isLeapYear(int year) const {
        return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
    }

    // 获取任意月份的天数
    int GetMonthDay(int year, int month) {
        static int monthArray[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        int day = monthArray[month];

        // 判断是否是闰年闰月
        if (month == 2 && isLeapYear(year)) {
            day = 29;
        }

        return day;
    }

    Date(int year, int month, int day)
        : _year(year)
        , _month(month)
        , _day(day)
    {}

    bool operator<(const Date& d) const {
        if (this->_year < d._year) {
            return true;
        } else if (this->_year == d._year && this->_month < d._month) {
            return true;
        } else if (this->_year == d._year && this->_month == d._month &&
                   this->_day < d._day) {
            return true;
        }
        return false;
    }

    bool operator!=(const Date& d) {
        if (this->_year != d._year || this->_month != d._month ||
                this->_day != d._day) return true;
        else return false;
    }

    Date& operator+=(int day) {
        _day += day;
        while (_day > GetMonthDay(_year, _month)) {
            // 如果日期不合法，就要往月进位
            _day -= GetMonthDay(_year, _month);
            ++_month;
            // 如果月不合法，就要往年进位
            if (_month > 12) {
                ++_year;
                _month = 1;
            }
        }
        return *this;
    }

    int operator-(const Date& d) {
        Date max = *this;
        Date min = d;
        if (*this < d) {
            max = d;
            min = *this;
        }
        int count = 1;
        while (min != max) {
            min += 1;
            ++count;
        }
        return count;
    }

private:
    int _year;
    int _month;
    int _day;
};

int main() {
    int year, month, day;

    scanf("%4d%2d%2d", &year, &month, &day);
    Date d1(year, month, day);
    scanf("%4d%2d%2d", &year, &month, &day);
    Date d2(year, month, day);

    cout << d1 - d2 << endl;

    return 0;
}

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