Blue Bridge Cup algorithm improves ID number upgrade

Original title link: http://lx.lanqiao.cn/problem.page?gpid=T325

Welcome to my Blue Bridge Cup OJ Problem Solution~ https://blog.csdn.net/richenyunqi/article/details/80192062

 Algorithms improve ID number upgrade  

Time limit: 1.0s Memory limit: 256.0MB

Problem Description

　　Beginning on October 1, 1999, the number of national identity cards has been increased from 15 digits to 18 digits. (Introduction to the 18-digit ID number). The upgrade method is:
　　1. Change the year in the 15-digit ID number from 2 digits (7, 8 digits) to four digits.
　　2. Finally add a verification code. Calculation scheme of verification code:
　　Multiply the first 17 digits by the corresponding coefficients (7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4 2) and add them up, then divide by 11 to get the remainder, 0-10 correspond to 1 0 x 9 8 7 6 5 4 3 2.
　　Please write a program, the user inputs a 15-digit ID number, and the program generates an 18-digit ID number. Assume that the four-digit year of all ID cards to be upgraded is 19××

input format

　　A 15-digit string, as the ID number

output format

　　An 18-bit string, as the upgraded ID number

sample input

110105491231002

Sample output

11010519491231002x

Data size and conventions

　　No need to judge whether the input 15-digit string is reasonable

java code:

import java.util. *;
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String s=in.nextLine();
		char a[]={
				 '1','0' ,'x' ,'9' ,'8' ,'7' ,'6' ,'5' ,'4' ,'3' ,'2'
		};
		int b[]={
				7 ,9 ,10, 5, 8 ,4, 6 ,3, 7 ,9 ,10 ,5, 8, 4 ,2
		};
		int ss=0;
		for(int i=0;i<s.length();++i){
			ss+=(s.charAt(i)-48)*b[i];
		}
		ss+=1*2+9;
		char c=a[ss%11];
		for(int i=0;i<6;++i){
			System.out.print(s.charAt(i));
		}
		System.out.print("19");
		for(int i=6;i<s.length();++i){
			System.out.print(s.charAt(i));
		}
		System.out.print(c);
	}
}