프로그래머스 : 신고 결과 받기

내 코드

import java.util.*;
import java.util.*;
class Solution {
    public int[] solution(String[] id_list, String[] report, int k) {
        int[] answer = new int[id_list.length];
        HashMap<String, ArrayList<String>> userTo = new HashMap();
        HashMap<String, Integer> userFrom = new HashMap();

        for (String id: id_list) {
            userTo.put(id, new ArrayList<>());
            userFrom.put(id, 0);
        }

        for (String repo: report) {
            String[] fromTo = repo.split(" ");
            if (userTo.get(fromTo[0]).contains(fromTo[1])) continue;

            userTo.get(fromTo[0]).add(fromTo[1]);
            userFrom.put(fromTo[1], userFrom.get(fromTo[1]) + 1);
        }

        for (String repo: report) {
            String[] fromTo = repo.split(" ");

            if (userFrom.get(fromTo[1]) < k) {
                userTo.get(fromTo[0]).remove(fromTo[1]);
            }
        }

        int idx = 0;
        for (String id: id_list) {
            answer[idx++] = userTo.get(id).size();
        }
        return answer;
    }
}

🤔