import java.util.Scanner; // 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 sc=new Scanner(System.in); int year=sc.nextInt(); int month=sc.nextInt(); int day=sc.nextInt(); int[] arr={0,31,28,31,30,31,30,31,31,30,31,30,31}; if((year%4==0&&year%...