프로그래머스 Lv1 - 두 개 뽑아서 더하기

문제링크 : https://programmers.co.kr/learn/courses/30/lessons/68644?language=java

코드

import java.util.*;

class Solution {

    public static void main(String[] args) {

        tester(new int[] {2,1,3,4,1},new int[] { 2,3,4,5,6,7});
        tester(new int[] {5,0,2,7},new int[] {2,5,7,9,12});
        return;
    }

    public static void tester(int[] numbers, int[] result)  {
        Solution s = new Solution();
        int[] ret = s.solution(numbers);
        for (int i=0 ; i<result.length ; i++) {
            if(ret[i] != result[i]) {
                System.out.println("Failed!");
                return;
            }
        }
        System.out.println("OK");
    }


    public int[] solution(int[] numbers) {

        //ArrayList<Integer> buf = new ArrayList<>();
        ArrayList<Integer> buf = new ArrayList<>();
        int n = numbers.length;

        for(int i=0 ; i<n ; i++) {
            for(int j=i+1 ; j<n ; j++) {
                int temp = numbers[i]+ numbers[j];
                if(buf.indexOf(temp) == -1) {
                    buf.add(temp);
                }

            }
        }

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

        Arrays.sort(answer);

        return answer;
    }
}