题解 | #柜台结账#

希望大佬们能写点难题的阅读性好点的题解 QAQ

import java.util.Scanner;

public class Main {

    static String PAY_MORE = "Happy birthday to MFGG";
    static String PAY_LESS = "Happy birthday to YXGG";
    static String PAY = "PLMM";

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String a1 = sc.next();
        String a2 = sc.next();
        // 小数部分大于 0.5
        if (a2.matches("(5\\d*[^0]\\d*)|([6-9]\\d*)")) {
            System.out.println(PAY_MORE);
        // 小数部分小于 0.5    
        } else if (a2.charAt(0) < '5') {
            if (a2.charAt(0) == '0') {
                System.out.println(PAY);
            } else {
                System.out.println(PAY_LESS);
            }
        // 等于0.5    
        } else {
            if (((a1.charAt(a1.length() - 1) - '0') & 1) == 0) {
                System.out.println(PAY_LESS);
            } else {
                System.out.println(PAY_MORE);
            }
        }
    }
}