题解 | 打印日期

#include<iostream>
#include<stdio.h>
using namespace std;
int main(){
	int y,n;
	while(cin>>y>>n){
		bool leapyear=(y%4==0&&y%100!=0)||(y%400==0);
		int month[]={31,leapyear?29:28,31,30,31,30,31,31,30,31,30,31};
		int order=0,M,D;
		int i=0;
		while(i<12){
			order+=month[i];
			if(order>=n){
				M=i+1;
				D=n-(order-month[i]);
				break;
			}
			else
			    i++;
		}
		printf("%04d-%02d-%02d\n",y,M,D);
	}
	
}