题解 | #回文日期#

判断一个日期是否是闰年需要判断的东西比较多，不过java推出的localDate可以直接帮我们计算不用我们自己来写函数来模拟，我们需要是不是回文就可以了

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Deque;
import java.util.LinkedList;
import java.util.Scanner;
public class Main {
    public static boolean isReaptNum(String a, int left, int right) {
        if (left < 0 || right >= a.length() || left >= right) {
            return false;
        }
        while (left < right) {
            if (a.charAt(left) != a.charAt(right)) {
                return false;
            }
            left++;
            right--;
        }
        return true;
    }
    public static boolean verify(LocalDate date1,LocalDate date2){
         if(date1.equals(date2)){
            return true;
        }
        if(date1.isBefore(date2)){
            return true;
        } else{
            return false;
        }
    }
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int from = scanner.nextInt();
        int to = scanner.nextInt();
        LocalDate fromTime = LocalDate.of(from / 10000, from % 10000 / 100, from % 100);
        LocalDate toTime = LocalDate.of(to / 10000, to % 10000 / 100, to % 100);
        DateTimeFormatter formatters = DateTimeFormatter.ofPattern("yyyyMMdd");
        int count = 0;
        while(verify(fromTime,toTime)){
            String format = fromTime.format(formatters);
            int right = format.length();
            if(isReaptNum(format,0,right-1)){
                count++;
            }
            fromTime = fromTime.plusDays(1L);
        }
        System.out.println(count);
        return;
    }
}