230520 방금그곡

private static HashMap<String, String> dict = new HashMap<>();

public String solution(String m, String[] musicinfos) {
    String answer = "(None)";

    initializeDictionary();
    m = change(m);

    int maxTime = 0;
    for (String musicInfo : musicinfos) {
        String[] temp = musicInfo.split(",");
        int time = getTime(temp[0], temp[1]);
        String music = change(temp[3]);

        music = repeatMusic(music, time);

        if (music.contains(m) && time > maxTime) {
            maxTime = time;
            answer = temp[2];
        }
    }

    return answer;
}

private void initializeDictionary() {
    dict.put("C#", "c");
    dict.put("D#", "d");
    dict.put("F#", "f");
    dict.put("G#", "g");
    dict.put("A#", "a");
}

private String change(String str) {
    for (String key : dict.keySet()) {
        str = str.replace(key, dict.get(key));
    }
    return str;
}

private int getTime(String str1, String str2) {
    String[] time1 = str1.split(":");
    String[] time2 = str2.split(":");

    int h1 = Integer.parseInt(time1[0]) * 60;
    int h2 = Integer.parseInt(time2[0]) * 60;

    int m1 = Integer.parseInt(time1[1]);
    int m2 = Integer.parseInt(time2[1]);

    return (h2 + m2) - (h1 + m1);
}

private String repeatMusic(String music, int time) {
    StringBuilder repeatedMusic = new StringBuilder();
    while (repeatedMusic.length() < time) {
        repeatedMusic.append(music);
    }
    return repeatedMusic.substring(0, time);
}

출처:https://school.programmers.co.kr/learn/courses/30/lessons/17683