Codility - Distinct

https://app.codility.com/programmers/lessons/6-sorting/distinct/start/

Codility

package codility.num6;

import java.util.HashSet;

public class Sorting {

    public int solution(int[] A) {
        // write your code in Java SE 8

        // 중복된 값을 허용하지 않는 HashSet 사용
        HashSet hs = new HashSet();

        for(int a : A){
            hs.add(a);
        }

        // Set의 크기를 리턴해준다.
        return hs.size();
    }


    public static void main(String[] args) {
        int[] arr = {2, 1, 1, 2, 3, 1};
        Sorting a = new Sorting();
        System.out.println(a.solution(arr));
    }
}