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 in = new Scanner(System.in);
        int n = in.nextInt();
        int x = in.nextInt();
        String s = String.valueOf(x);
        int count = 0;
        for (int i = 1; i <= n ; i++){
         String s1 = String.valueOf(i);
         int times = s1.length() - s1.replace(s,"").length();
         count += times;
        }
        System.out.println(count);
    }
}