first commit

JKT013 - SỐ LỘC PHÁT.java

@@ -0,0 +1,38 @@
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    static ArrayList<String> dp = new ArrayList<>();
+    static void Try(int i, int n, String s){
+        if(!s.isEmpty()) dp.add(s);
+        if(i==n) return;
+        Try(i+1,n,s+"6");
+        Try(i+1,n,s+"8");
+    }
+    public static void main(String[] args) throws IOException, ClassNotFoundException {
+        // Scanner sc = new Scanner(new File("ONLINE.in"));
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+        Try(0, 15, "");
+        Collections.sort(dp, new Comparator<String>() {
+            @Override
+            public int compare(String a, String b){
+                if(a.length() == b.length()) return a.compareTo(b);
+                return a.length() - b.length();
+            }
+        });
+        while(t-->0){
+            int n=sc.nextInt();
+            int cnt=0;
+            for(int i=0;i<dp.size();i++){
+                if(dp.get(i).length()<=n) cnt++;
+                else break;
+            }
+            System.out.println(cnt);
+            for(int i=cnt-1;i>=0;i--){
+                if(dp.get(i).length()<=n) System.out.printf("%s ",dp.get(i));
+            }
+            System.out.println();
+        }
+    }
+}