题解 | #打印日期#

#include <bits/stdc++.h>

using namespace std;

const int months[]={
	0,31,28,31,30,31,30,31,31,30,31,30,31
};

int is_leap(int year){
	if((year%4==0 && year%100!=0) || year%400 == 0){
		return 1;
	}
	return 0;
}

int get_days(int year, int month){
	int res = months[month];
	if (month == 2){
		res += is_leap(year);
	}
	
	return res;
}

int main(){
	int year, d;
	while (cin >> year >> d){
		for (int i=1; i<=12; i++){
			if (d <= get_days(year, i)){
				printf("%04d-%02d-%02d\n", year, i, d);
				break;
			}
			else{
				d = d - get_days(year, i);
			}
		}
	}
		 
	return 0;
}