自守数（JAVA）暴力

注意下1就好

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        while (in.hasNext()){
            int n = in.nextInt();
            int res = 0;
            for (int i = 0; i < n; i++){
                int k = 1;
                while(k < i) k*= 10;
                int b = i * i / k;
                int c = i * i - b * k;
                if (c == i){
                    res++;
                }
            }
            System.out.println(res+1);
        }
    }
}