题解 | #获得月份天数#

import java.util.Scanner;
import java.time.LocalDateTime;
import java.time.LocalDate;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String[] a = in.nextLine().split(" ");
            System.out.println(LocalDate.of(Integer.valueOf(a[0]), Integer.parseInt(a[1]), 2).lengthOfMonth());
        }
    }
}