기존 알고리즘 Log로 보던 데이터를 @Test사용해서 Assert로 다 바꿔보자.

기존

    public void main() {
        String[] id_list = {"muzi", "frodo", "apeach", "neo"};
        String[] report = {"muzi frodo", "apeach frodo", "frodo neo", "muzi neo", "apeach muzi"};
//        String[] id_list = {"con", "ryan"};
//        String[] report = {"ryan con", "ryan con", "ryan con", "ryan con"};

        solution(id_list, report, 2);
    }

    public int[] solution(String[] id_list, String[] report, int k) {
        // [신고당한사람, 신고한사람List]
        HashMap<String, Set<String>> reportList = new HashMap<>();

        // 첫번째 select
        IntStream.range(0, report.length)
                .forEach(i -> System.out.print(", report1[" + i + "] = " + report[i]));
        System.out.println();
        //

        //삭제
        int i = 0;
        //

        for (String reportInfo : report) {
            // [고발한사람, 당한 사람]
            String[] infoDeatail = reportInfo.split(" ");

            // 두번째 select
            System.out.println("reportInfo[" + i++ + "] = { " + infoDeatail[0] + " , "  + infoDeatail[1] + " }");
            //

            Set<String> curReportInfo = reportList.getOrDefault(infoDeatail[1], new HashSet<>());
            curReportInfo.add(infoDeatail[0]);
            reportList.put(infoDeatail[1], curReportInfo);
        }

        HashMap<String, Integer> reportAlarmList = new LinkedHashMap<>();
        Arrays.stream(id_list)
                .forEach(id -> reportAlarmList.put(id, 0));

        System.out.println("reportAlarmList.entrySet() = " + reportAlarmList.entrySet());

        System.out.println("reportList.entrySet() = " + reportList.entrySet());

        for (Map.Entry<String, Set<String>> reportInfo: reportList.entrySet()) {
            System.out.print("{ reportInfo.getKey() = " + reportInfo.getKey());
            System.out.println(" ,reportInfo.getValue() = " + reportInfo.getValue() + "}");

            if (reportInfo.getValue().size() >= k) {
                for (String name : reportInfo.getValue()) {
                    reportAlarmList.put(name, reportAlarmList.get(name) + 1);
                }
            }
        }

        System.out.println("reportAlarmList.entrySet() = " + reportAlarmList.entrySet());

        int[] dd = reportAlarmList.entrySet().stream()
                .mapToInt(x -> x.getValue())
                .toArray();

        return new int[2];
    }