39 lines
1.2 KiB
Java
39 lines
1.2 KiB
Java
import java.util.*;
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import java.io.*;
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public class Main {
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static ArrayList<String> dp = new ArrayList<>();
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static void Try(int i, int n, String s){
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if(!s.isEmpty()) dp.add(s);
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if(i==n) return;
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Try(i+1,n,s+"6");
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Try(i+1,n,s+"8");
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}
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public static void main(String[] args) throws IOException, ClassNotFoundException {
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// Scanner sc = new Scanner(new File("ONLINE.in"));
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Scanner sc = new Scanner(System.in);
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int t = sc.nextInt();
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Try(0, 15, "");
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Collections.sort(dp, new Comparator<String>() {
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@Override
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public int compare(String a, String b){
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if(a.length() == b.length()) return a.compareTo(b);
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return a.length() - b.length();
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}
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});
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while(t-->0){
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int n=sc.nextInt();
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int cnt=0;
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for(int i=0;i<dp.size();i++){
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if(dp.get(i).length()<=n) cnt++;
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else break;
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}
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System.out.println(cnt);
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for(int i=cnt-1;i>=0;i--){
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if(dp.get(i).length()<=n) System.out.printf("%s ",dp.get(i));
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}
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System.out.println();
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}
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}
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}
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