华中科技大学 打印日期

自己写的很麻烦，直接套的日期模板，纯属为了撸一下模板
网上有很多简介的代码

#include<bits/stdc++.h>
#define ISYEAP(x) x%4==0&&x%100!=0||x%400==0?1:0
using namespace std;
int daymonth[13][2]={
    0,0,
    31,31,
    28,29,
    31,31,
    30,30,
    31,31,
    30,30,
    31,31,
    31,31,
    30,30,
    31,31,
    30,30,
    31,31
};
struct date{
    int year;
    int month;
    int day;
    void nextday(){
        day++;
        if(day>daymonth[month][ISYEAP(year)]){
            day=1;
            month++;
            if(month>=13){
                month=1;
                year++;
            }
        }
    }
};
int main(){
    date temp;
    int year,n;
    while(scanf("%d %d",&year,&n)!=EOF){
        int count=1;
        temp.year=year;
        temp.day=1;
        temp.month=1;
        while(count!=n){
            temp.nextday();
            count++;
        }
        printf("%04d-%02d-%02d\n",temp.year,temp.month,temp.day);
    }
    return 0;
}