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给定一个 k+1 位的正整数 N,写成 ak…a1a0 的形式,其中对所有 i 有 0 <= ai < 10 且 ak > 0。N 被称为一个回文数,当且仅当对所有 i 有 ai = ak-i。零也被定义为一个回文数。
非回文数也可以通过一系列操作变出回文数。首先将该数字逆转,再将逆转数与该数相加,如果和还不是一个回文数,就重复这个逆转再相加的操作,直到一个回文数出现。如果一个非回文数可以变出回文数,就称这个数为延迟的回文数。(定义翻译自 https://en.wikipedia.org/wiki/Palindromic_number)
给定任意一个正整数,本题要求你找到其变出的那个回文数。
输入格式:
输入在一行中给出一个不超过1000位的正整数。
输出格式:
对给定的整数,一行一行输出其变出回文数的过程。每行格式如下
A + B = C
其中A是原始的数字,B是A的逆转数,C是它们的和。A从输入的整数开始。重复操作直到C在10步以内变成回文数,这时在一行中输出“C is a palindromic number.”;或者如果10步都没能得到回文数,最后就在一行中输出“Not found in 10 iterations.”。
输入样例 1:
97152
输出样例 1:
97152 + 25179 = 122331
122331 + 133221 = 255552
255552 is a palindromic number.
输入样例 2:
196
输出样例 2:
196 + 691 = 887
887 + 788 = 1675
1675 + 5761 = 7436
7436 + 6347 = 13783
13783 + 38731 = 52514
52514 + 41525 = 94039
94039 + 93049 = 187088
187088 + 880781 = 1067869
1067869 + 9687601 = 10755470
10755470 + 07455701 = 18211171
Not found in 10 iterations.
Code is below:
note:
- be care, the single bit also seems as the Palindromic number.
- so, should print like “0 is a palindromic number.”
- be care that, when the user input the Palindromic number, just print out
no need to print Palindromic + Palindromic = ….
import java.math.BigInteger;
import java.util.Scanner;public class Main {public static StringBuilder stringBuilder = new StringBuilder();public static void changeToPalindromicNumber(String number, int count) {BigInteger a = new BigInteger(number);String reversedNumber = reverseTheNumber(number);String result = a.add(new BigInteger(reversedNumber)).toString();count--;if (isPalindromicNumber(result)) {System.out.println(result + " is a palindromic number.");return;}if (0 == count){System.out.println("Not found in 10 iterations.");return;}System.out.println(number + " + " + reversedNumber + " = " + result);changeToPalindromicNumber(result, count);}public static String reverseTheNumber(String number) {return stringBuilder.replace(0, stringBuilder.length(), number).reverse().toString();}public static boolean isPalindromicNumber(String number) {if (isNullOrEnpty(number)) {return false;}for (int start = 0, end = number.length() - 1; start < number.length() / 2; ++start, --end) {if (number.charAt(start) != number.charAt(end)) {return false;}}return true;}public static boolean isNullOrEnpty(String number) {return null == number || number.isEmpty();}public static void main(String[] args) {Scanner in = new Scanner(System.in);String number = in.next();changeToPalindromicNumber(number, 10);}
}
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