蓝桥杯历届试题-回文数字-题解（Java代码）==

        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        int count=0;
        for (int i = 10000; i <= 999999; i++) {
            long hw = i;
            long h = hw;
            long y = 0;
            while (hw > 0) {
                y = y * 10 + hw % 10;
                hw = hw / 10;
                if (y == h) {
                    char[] c = String.valueOf(i).toCharArray();
                    int sum = 0;
                    for (int j = 0; j < c.length; j++) {
                        sum += (c[j] - '0');
                    }
                    if (sum == num) {
                        System.out.println(i);
                        count++;
                    }
                }
            }
        }
        if (count==0)
        {
        System.out.println(-1);    
        }