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

package com.programmers;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

public class P12906 {

public static int[] solution12906(int[] arr){

List<Integer> result= new ArrayList<>();

result.add(arr[0]);

for(int i= 1; i < arr.length; i++){

if(arr[i] == arr[i-1]){

continue;

} else{

result.add(arr[i]);

}

}

// 스트림 사용

int[] answer= result.stream().mapToInt(Integer::intValue).toArray();

// List<Integer>를 int[]로 변환

// int[] answer = new int[result.size()];

// for (int i = 0; i < result.size(); i++) {

// answer[i] = result.get(i);

// }

return answer;

}

public static void main(String args[]){

System.out.println(Arrays.toString(solution12906(new int[]{1, 1, 3, 3, 0, 1, 1})));

System.out.println(Arrays.toString(solution12906(new int[]{4, 4, 4, 3, 3})));

}

}