1 题目

2 代码

import java.util.Scanner;

public class B1031 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();

        int[] weight = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
        char[] M = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
        int sum = N;
        for (int i = 0; i < N; i++) {
            String str = sc.next();
            char[] input = str.toCharArray();

            boolean flag = true;
            for (int j = 0; j < input.length - 1; j++) {
                if (!(input[j] >= '0' && input[j] <= '9')) {
                    flag = false;
                }
            }

            if (flag) {
                int n = 0;
                for (int j = 0; j < input.length - 1; j++) {
                    n += Integer.parseInt(Character.toString(input[j])) * weight[j];
                }
                int Z = n % 11;
                if (M[Z] != input[17]) {
                    sum--;
                    System.out.println(str);
                }
            } else {
                sum--;
                System.out.println(str);
            }
        }

        if (sum == N) {
            System.out.println("All passed");
        }
    }
}

3 要点

（1）看清题目要去即可，关键在于对字符串的处理。