题解 | #日期累加#利用构造函数

class Date{
    public:
    bool isleapyear(int year){
        return year%4==0&&year%100!=0||year%400==0;
        }
    int getmonthday(int year,int month){
        static int monthday[]={31,28,31,30,31,30,31,31,30,31,30,31};
        return monthday[month-1]+(month==2&& isleapyear(year)?1:0);
    }
    Date()
    {
        int extday;
        scanf("%d%d%d%d",&_year,&_month,&_day,&extday);
        _day+=extday;
        while(_day>getmonthday(_year, _month)){
            _day-=getmonthday(_year, _month++);
            if(_month==13){
                _year++;
                _month=1;
            }
        }
    }
    void display(){
        printf("%04d-%02d-%02d\n",_year,_month,_day);
    }
    private:
    int _year;
    int _month;
    int _day;
};
int main(){
    int n;
    scanf("%d",&n);
    Date data [n];
    for(int i=0;i<n;i++){
        data[i].display();
    }
    return 0;
}