题解 | #[NOIP2013]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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        int x = sc.nextInt();
        int count = 0;
        for(int i = 1 ;i <=n;i++){
            String s = String.valueOf(i);
            int len = s.length();
            for(int j = 0; j<len ;j++){
                char c = s.charAt(j);
                int b = c -48;
                if(b == x){
                    count ++;
                }
            }
        }
        System.out.println(count);
    }
}