题解 | #打印日期#

#include<iostream>
#include<map>
using namespace std;

//例题2.7 打印日期
int isLearYear(int year) {
	if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
		return 1;
	}
	return 0;
}

int main()
{
	int y, n, res1, res2;
	map<int, int> maps = { {1,31},{2,28},{3,31},{4,30},{5,31},{6,30},{7,31},{8,31},{9,30},{10,31},{11,30},{12,31} };
	while (cin >> y >> n) {
		int i = 0, temp = 0;
		for (i = 1; i <= 12; i++) {
			if (temp >= n) {
				break;
			}
			if (i == 2 && isLearYear(y) == 1) {
				temp += (maps[i] + 1);
			}
			else {
				temp += maps[i];
			}
		}
		int d = i == 3 && isLearYear(y)==1 ? n - (temp - maps[i - 1] - 1) : n - (temp - maps[i - 1]);
		
		printf("%d-%02d-%02d\n", y, i - 1, d);
	}

	return 0;
}