020-002-003

Set: No Duplicate Collection

Hard

Problem Description

Set: No Duplicate Collection

Learning Objective

Learn how to create collections without duplicates using Set.

Problem

Input multiple numbers and display the count after removing duplicates.

Input

Line 1: Count of numbers N
Line 2+: N numbers

Output

Unique count: [count without duplicates].

Test Cases

※ Output examples follow programming industry standards

Input:

Expected Output:

Unique count: 3

Input:

Expected Output:

Unique count: 1

❌ Some tests failed

❌ エラー発生

Your Solution

Current Mode:● My Code

import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    // Write your code here

    sc.close();
  }
}

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