题解 | 记数问题

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int x = scanner.nextInt();

        int count = 0;

        // 方法一：暴力枚举
        for (int i = 1; i <= n; i++) {
            int num = i;
            while (num > 0) {
                if (num % 10 == x) {
                    count++;
                }
                num /= 10;
            }
        }

        System.out.println(count);
        scanner.close();
    }
}