题解 | #打印日期#

#include <iostream>
using namespace std;
int GetMonthDay(int year,int month)
{
    int arr[13] = {-1, 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 arr[month];
}
void fun(int& year, int& month, int& day) {
    while (day > GetMonthDay(year, month) ) {
        day -= GetMonthDay(year, month);
        ++month;
    }
}
int main() {
    int a, b;
    while (cin >> a >> b) { // 注意 while 处理多个 case
        int month = 1;
        fun(a, month, b);
        printf("%4d%c%02d%c%02d\n", a, '-', month, '-', b);
    }
}
// 64 位输出请用 printf("%lld")