[Lv. 1] 같은 숫자는 싫어

class Solution {
    public int[] solution(int []arr) {
        int[] answer = {};
        ArrayList<Integer> list = new ArrayList<>();
        int num = -1;

        for(int i = 0; i<arr.length; i++){
            if(arr[i] != num){
                list.add(arr[i]);
                num = arr[i];
            }
        }

        answer = new int[list.size()];
        for(int i = 0; i<answer.length; i++){
            answer[i] = list.get(i);
        }


        return answer;
    }
}