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闰年的计算方式:
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
int y;
Scanner s=new Scanner(System.in);
y=s.nextInt();
if(y>=1990 &&y <= 2050){
if(y%4==0&&y%100!=0||y%400==0){
System.out.println("yes");
}
else{
System.out.println("no");
}
}else{
System.out.println("no");
}
}
}