[알고리즘문제풀기] 수열과 구간 쿼리 3

문제

내가 작성한 정답

class Solution {
    public int[] solution(int[] arr, int[][] queries) {
        for(int i=0; i<queries.length; i++){
            int a = arr[queries[i][0]];
            arr[queries[i][0]] = arr[queries[i][1]];
            arr[queries[i][1]] = a;
        }
        return arr;
    }
}

다른 사람들의 정답

import java.util.Arrays;

class Solution {
    public int[] solution(int[] arr, int[][] queries) {
        int[] answer = Arrays.copyOf(arr, arr.length);

        for (int[] query : queries) {
            int i = query[0];
            int j = query[1];

            int temp = answer[i];
            answer[i] = answer[j];
            answer[j] = temp;
        }

        return answer;
    }
}

import java.util.*;
import java.util.stream.Collectors;

class Solution {
    public List<Integer> solution(int[] arr, int[][] queries) {
        List<Integer> list = Arrays.stream(arr).boxed().collect(Collectors.toList());

        for (int[] query : queries) {
            Collections.swap(list, query[0], query[1]);
        }
        return list;
    }
}