diff --git "a/jiwon1217/week13/\352\260\231\354\235\200_\354\210\253\354\236\220\353\212\224_\354\213\253\354\226\264.java" "b/jiwon1217/week13/\352\260\231\354\235\200_\354\210\253\354\236\220\353\212\224_\354\213\253\354\226\264.java"
new file mode 100644
index 0000000..24418af
--- /dev/null
+++ "b/jiwon1217/week13/\352\260\231\354\235\200_\354\210\253\354\236\220\353\212\224_\354\213\253\354\226\264.java"
@@ -0,0 +1,27 @@
+package jiwon1217.week13;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class 같은_숫자는_싫어 {
+    /**
+     * 문제 풀이
+     * 1. arr에서 연속된 숫자가 중복되는 부분을 제거하고, 첫 번째 값만 남김
+     * 시간 복잡도
+     * N: 배열 arr의 크기
+     * O(N)
+     */
+    public int[] solution(int[] arr) {
+        List<Integer> list = new ArrayList<>();
+        list.add(arr[0]);
+
+        for (int i = 1; i < arr.length; i++) {
+            if (arr[i - 1] != arr[i]) {
+                list.add(arr[i]);
+            }
+        }
+        int[] answer = list.stream().mapToInt(i -> i).toArray();
+
+        return answer;
+    }
+}
diff --git "a/jiwon1217/week13/\353\262\240\354\212\244\355\212\270\354\225\250\353\262\224.java" "b/jiwon1217/week13/\353\262\240\354\212\244\355\212\270\354\225\250\353\262\224.java"
new file mode 100644
index 0000000..7f9fb6b
--- /dev/null
+++ "b/jiwon1217/week13/\353\262\240\354\212\244\355\212\270\354\225\250\353\262\224.java"
@@ -0,0 +1,49 @@
+package jiwon1217.week13;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class 베스트앨범 {
+    /**
+     * 문제 풀이
+     * 1. 순회하며 장르별 총 재생횟수 계산하고, 장르별 노래 리스트 추가
+     * 2. 장르 정렬, 각 장르별 노래 정렬
+     * 3. 최대 2곡씩 선택
+     * 시간 복잡도
+     * N: 장르의 길이
+     * O(NlogN)
+     */
+    public int[] solution(String[] genres, int[] plays) {
+        Map<String, Integer> genreTotalPlays = new HashMap<>();
+        Map<String, List<int[]>> genreToSongs = new HashMap<>();
+
+        for (int i = 0; i < genres.length; i++) {
+            genreTotalPlays.put(genres[i], genreTotalPlays.getOrDefault(genres[i], 0) + plays[i]);
+
+            genreToSongs.computeIfAbsent(genres[i], k -> new ArrayList<>())
+                .add(new int[]{i, plays[i]});
+        }
+        List<String> sortedGenres = new ArrayList<>(genreTotalPlays.keySet());
+        sortedGenres.sort((a, b) -> genreTotalPlays.get(b) - genreTotalPlays.get(a));
+
+        List<Integer> answer = new ArrayList<>();
+
+        for (String genre : sortedGenres) {
+            List<int[]> songs = genreToSongs.get(genre);
+
+            songs.sort((s1, s2) -> {
+                if (s2[1] != s1[1]) {
+                    return s2[1] - s1[1];
+                }
+                return s1[0] - s2[0];
+            });
+
+            for (int i = 0; i < Math.min(2, songs.size()); i++) {
+                answer.add(songs.get(i)[0]);
+            }
+        }
+        return answer.stream().mapToInt(i -> i).toArray();
+    }
+}