蓝桥杯 基础练习 特殊回文数

问题描述

Java 代码实现

import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int n = in.nextInt();
        for (int i = 10000; i < 1000000; ++i) {
            String s = String.valueOf(i);
            StringBuilder reverse = new StringBuilder(s);// 记录反转后数字
            if (s.equals(reverse.reverse().toString())) {
                char[] ch = s.toCharArray();// 逆序取出数字
                final int len = s.length();
                int sum = 0;
                for (int j = len-1; j >= 0; --j) {
                    sum += ch[j]-'0';
                }
                if (sum == n) {
                   System.out.println(s); 
                }
            }
        }

        in.close();
    }
}