问题 D: 【明明的随机数】

D.java

@@ -0,0 +1,28 @@
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class D {
+    public static void main(String[] args) {
+        int[] a = new int[cin.nextInt()];
+        for (int i = 0; i < a.length; i++) {
+            a[i] = cin.nextInt();
+        }
+
+        Arrays.sort(a);
+        int count = 0;
+        for (int i = 0; i < a.length; i++) {
+            if (i == 0 || a[i] != a[i - 1])
+                ++count;
+        }
+        System.out.println(count);
+
+
+        for (int i = 0; i < a.length; i++) {
+            if (i == 0 || a[i] != a[i - 1])
+                System.out.print(a[i] + " ");
+        }
+        System.out.println();
+    }
+
+    static Scanner cin = new Scanner(System.in);
+}