[Programmers] Lv1: 같은 숫자는 싫어(12906)

문제

- 링크: https://school.programmers.co.kr/learn/courses/30/lessons/12906

 

풀이

import java.util.*;

public class Solution {
    public int[] solution(int []arr) {
        ArrayList<Integer> answer = new ArrayList<>();
        answer.add(arr[0]);
        for (int i = 1; i < arr.length; ++i) {
            if (arr[i-1] != arr[i]) {
                answer.add(arr[i]);
            }
        }

        return answer.stream().mapToInt(Integer::intValue).toArray();
    }
}