diff --git "a/algorithm-study/src/main/java/week05/boj13417/\354\271\264\353\223\234\353\254\270\354\236\220\354\227\264_\354\226\221\353\257\274\354\204\255.java" "b/algorithm-study/src/main/java/week05/boj13417/\354\271\264\353\223\234\353\254\270\354\236\220\354\227\264_\354\226\221\353\257\274\354\204\255.java"
new file mode 100644
index 0000000..f22ed7a
--- /dev/null
+++ "b/algorithm-study/src/main/java/week05/boj13417/\354\271\264\353\223\234\353\254\270\354\236\220\354\227\264_\354\226\221\353\257\274\354\204\255.java"
@@ -0,0 +1,45 @@
+package main.java.week05.boj13417;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Deque;
+import java.util.LinkedList;
+import java.util.StringTokenizer;
+
+public class 카드문자열_양민섭 {
+    //메모리 : 29296KB, 시간 : 284ms
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int T = Integer.parseInt(br.readLine()); // 테스트 데이터 개수
+
+        StringBuilder result = new StringBuilder();
+
+        for (int t = 0; t < T; t++) {
+            int N = Integer.parseInt(br.readLine());  // 카드 개수
+            StringTokenizer st = new StringTokenizer(br.readLine());
+
+            Deque<Character> deque = new LinkedList<>();
+
+            // 첫번째 카드
+            deque.add(st.nextToken().charAt(0));
+            // 나머지 카드
+            for (int i = 1; i < N; i++) {
+                char c = st.nextToken().charAt(0);
+                if (c <= deque.peekFirst()) { // char 은 기본형 타입이라 null 못 받음. 그래서 NPE 경고 나옴.
+                    deque.addFirst(c);  // 가장 앞 글자보다 작 . 같 왼쪽에 추가
+                } else {
+                    deque.addLast(c);   // 아니라면 오른쪽에 추가
+                }
+            }
+
+            // 덱을 문자열로 변환
+            StringBuilder sb = new StringBuilder();
+            for (char c : deque) {
+                sb.append(c);
+            }
+            result.append(sb).append("\n"); // 테스트끼리 분리
+        }
+        System.out.print(result);
+    }
+}
\ No newline at end of file
diff --git "a/algorithm-study/src/main/java/week05/boj20301/\353\260\230\354\240\204_\354\232\224\354\204\270\355\221\270\354\212\244_\354\226\221\353\257\274\354\204\255.java" "b/algorithm-study/src/main/java/week05/boj20301/\353\260\230\354\240\204_\354\232\224\354\204\270\355\221\270\354\212\244_\354\226\221\353\257\274\354\204\255.java"
new file mode 100644
index 0000000..e317bfe
--- /dev/null
+++ "b/algorithm-study/src/main/java/week05/boj20301/\353\260\230\354\240\204_\354\232\224\354\204\270\355\221\270\354\212\244_\354\226\221\353\257\274\354\204\255.java"
@@ -0,0 +1,58 @@
+package main.java.week05.boj20301;
+
+import java.io.*;
+import java.util.LinkedList;
+import java.util.StringTokenizer;
+
+public class 반전_요세푸스_양민섭 {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        int N = Integer.parseInt(st.nextToken());
+        int K = Integer.parseInt(st.nextToken());
+        int M = Integer.parseInt(st.nextToken());
+
+        // 사람들을 1..N까지 넣어둔다
+        LinkedList<Integer> circle = new LinkedList<>();
+        for (int i = 1; i <= N; i++) {
+            circle.add(i);
+        }
+
+        StringBuilder out = new StringBuilder();
+
+        boolean clockwise = true; // 처음엔 오른쪽(시계 방향)으로 돈다
+        int removed = 0;          // 지금까지 제거된 사람 수
+
+        while (!circle.isEmpty()) {
+            if (clockwise) {
+                // 시계 방향: K-1번 앞에서 빼서 뒤에 붙인다
+                for (int i = 0; i < K - 1; i++) {
+                    int x = circle.removeFirst();
+                    circle.addLast(x);
+                }
+                // K번째를 제거
+                int dead = circle.removeFirst();
+                out.append(dead).append('\n');
+            } else {
+                // 반시계 방향: K-1번 뒤에서 빼서 앞에 붙인다
+                for (int i = 0; i < K - 1; i++) {
+                    int x = circle.removeLast();
+                    circle.addFirst(x);
+                }
+                // K번째를 제거 (반시계라서 뒤에서 제거)
+                int dead = circle.removeLast();
+                out.append(dead).append('\n');
+            }
+
+            removed++;
+
+            // M명 제거될 때마다 방향을 뒤집는다
+            if (removed % M == 0) {
+                clockwise = !clockwise;
+            }
+        }
+
+        System.out.print(out.toString());
+    }
+}
diff --git "a/algorithm-study/src/main/java/week05/boj2346/\355\222\215\354\204\240_\355\204\260\353\234\250\353\246\254\352\270\260_\354\226\221\353\257\274\354\204\255.java" "b/algorithm-study/src/main/java/week05/boj2346/\355\222\215\354\204\240_\355\204\260\353\234\250\353\246\254\352\270\260_\354\226\221\353\257\274\354\204\255.java"
new file mode 100644
index 0000000..30a260c
--- /dev/null
+++ "b/algorithm-study/src/main/java/week05/boj2346/\355\222\215\354\204\240_\355\204\260\353\234\250\353\246\254\352\270\260_\354\226\221\353\257\274\354\204\255.java"
@@ -0,0 +1,46 @@
+package main.java.week05.boj2346;
+
+import java.io.*;
+import java.util.*;
+
+public class 풍선_터뜨리기_양민섭 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine());
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        Deque<int[]> dq = new ArrayDeque<>();
+        // [번호, 이동값]
+        for (int i = 1; i <= N; i++) {
+            int move = Integer.parseInt(st.nextToken());
+            dq.addLast(new int[]{i, move});
+        }
+
+        StringBuilder sb = new StringBuilder();
+
+        int[] current = dq.pollFirst(); // 첫 풍선 터뜨리기
+        sb.append(current[0]).append(' ');
+
+        while (!dq.isEmpty()) {
+            int move = current[1];
+
+            if (move > 0) {
+                // 오른쪽(앞)으로 move-1번 회전
+                for (int i = 0; i < move - 1; i++) {
+                    dq.addLast(dq.pollFirst());
+                }
+                current = dq.pollFirst();
+            } else {
+                // 왼쪽(뒤)으로 |move|-1번 회전
+                for (int i = 0; i < (-move) - 1; i++) {
+                    dq.addFirst(dq.pollLast());
+                }
+                current = dq.pollLast();
+            }
+
+            sb.append(current[0]).append(' ');
+        }
+
+        System.out.println(sb.toString().trim());
+    }
+}
diff --git a/out/production/algorithm-study/main/java/week01/boj15649/README.md b/out/production/algorithm-study/main/java/week01/boj15649/README.md
new file mode 100644
index 0000000..7c97548
--- /dev/null
+++ b/out/production/algorithm-study/main/java/week01/boj15649/README.md
@@ -0,0 +1,105 @@
+# BOJ 15649
+
+문제) 자연수 N과 M이 주어졌을 때, 아래 조건을 만족하는 길이가 M인 수열을 모두 구하는 프로그램을 작성하시오.
+
+- 조건) 1부터 N까지 자연수 중에서 중복 없이 M개를 고른 수열
+- 예) N=4, M=2 : [1,2], [1,3], [1,4], [2,1], [2,3], [2,4], [3,1], [3,2], [3,4], [4,1], [4,2], [4,3]
+
+## 백트래킹
+- 시도 -> 실패 -> 되돌아감을 반복하면서 정답을 찾아가는 알고리즘
+- 재귀적으로 문제를 해결한다.
+  - 재귀 -> 본인을 다시 호출 (예: 팩토리얼)
+  ```java
+   public class Factorial {
+       public static void main(String[] args) {
+           System.out.println(factorial(4));
+       }
+    
+       public static int factorial(int n) {
+           if (n == 1) return 1;
+  
+           return n * factorial(n - 1);
+       }
+   }
+    
+   /*
+   n = 4 -> 4 * factorial(3) ==> 24
+       n = 3 -> 3 * factorial(2) ==> 6
+           n = 2 -> 2 * factorial(1) ==> 2
+               n = 1 -> 1
+   */
+        
+    ```
+  
+## 수열
+- 예제) 1부터 4까지 자연수 중에서 중복 없이 3개를 고른 수열
+```
+depth  (0)      (1)      (2)  
+        1 ────── 2 ────── 3
+            │         └── 4 
+            │
+            ├─── 3 ────── 2
+            │         └── 4 
+            │     
+            └─── 4 ────── 2
+                      └── 3
+        
+        2 ...
+```
+
+- `boolean visited[n]` : 방문한 숫자를 알아낸다.
+- `int[] arr[m]` : 수열을 배열 형태로 저장
+- `int depth` : 몇 번째 수열인지 가르키기 위한 값
+
+```
+static void backtracking(int depth) {
+        if (depth == arr.length) {
+            for (int value : arr) {
+                System.out.print(value + " ");
+            }
+            System.out.println();
+            return;
+        }
+
+        for (int i = 0; i < visited.length; i++) {
+            if (!visited[i]) {
+                visited[i] = true;
+                arr[depth] = i + 1;
+                backtracking(depth + 1);
+                visited[i] = false;
+            }
+        }
+    }
+        
+# backtracking(0) -> i = 0, visitied[0] = true, arr[0] = 1, backtracking(1)
+                  └── ## backtracking(1) -> i = 0, visited[0] 이미 true
+                                        -> i = 1, visited[1] = true, arr[1] = 2, backtracking(2)
+                                        └── ### backtracking(2) -> i = 0, visited[0] 이미 true
+                                                            -> i = 1, visited[1] 이미 true
+                                                            -> i = 2, visited[2] = true, arr[2] = 3, backtracking(3)
+                                                            └── #### backtracking(3) -> depth == arr.length, [1, 2, 3] ==> visited[2] = false
+                                    
+                                                            -> i = 3, visited[3] = true, arr[3] = 4, backtracking(3)
+                                                            └── #### backtracking(3) -> depth == arr.length, [1, 2, 4] ==> visited[3] = false
+                                        
+                                        -> i = 2, visited[2] = true, arr[2] = 3, backtrakcing(2)
+                                        └── ### backtracking(2) -> i = 0, visited[0] 이미 true
+                                                            -> i = 1, visited[1] = true, arr[2] = 2, backtracking(3)
+                                                            └── #### backtracking(3) -> depth == arr.length, [1, 3, 2] ==> visited[1] = false
+                                    
+                                                            -> i = 2, visited[2] 이미 true
+                                                            -> i = 3, visited[3] = true, arr[2] = 4, backtracking(3)
+                                                            └── #### backtracking(3) -> depth == arr.length, [1, 3, 4] ==> visited[3] = false
+                                        
+                                        -> i = 3, visited[3] = true, arr[3] = 4, backtracking(2)
+                                        └── ### backtracking(2) -> i = 0, visited[0] 이미 true
+                                                            -> i = 1, visited[1] = true, arr[2] = 2, backtracking(3)
+                                                            └── #### backtracking(3) -> depth == arr.length, [1, 4, 2] ==> visited[1] = false
+                                    
+                                                            -> i = 2, visited[2] = true, arr[2] = 3, backtracking(3)
+                                                            └── #### backtracking(3) -> depth == arr.length, [1, 4, 3] ==> visited[2] = false
+                                                            
+                                                            -> i = 3, visited[3] 이미 true
+                  
+                  -> i = 1, ...                                        
+```
\ No newline at end of file
diff --git a/out/production/algorithm-study/main/java/week02/boj17219/problem.md b/out/production/algorithm-study/main/java/week02/boj17219/problem.md
new file mode 100644
index 0000000..a34c23d
--- /dev/null
+++ b/out/production/algorithm-study/main/java/week02/boj17219/problem.md
@@ -0,0 +1,61 @@
+# [비밀번호 찾기](https://www.acmicpc.net/problem/17219)
+
+## 문제
+- 2019 HEPC - MAVEN League의 "비밀번호 만들기"와 같은 방식으로 비밀번호를 만든 경민이는 한 가지 문제점을 발견하였다. 
+- 비밀번호가 랜덤으로 만들어져서 기억을 못 한다는 것이었다! 그래서 경민이는 메모장에 사이트의 주소와 비밀번호를 저장해두기로 했다. 
+- 하지만 컴맹인 경민이는 메모장에서 찾기 기능을 활용하지 못하고 직접 눈으로 사이트의 주소와 비밀번호를 찾았다. 
+- 메모장에 저장된 사이트의 수가 늘어나면서 경민이는 비밀번호를 찾는 일에 시간을 너무 많이 쓰게 되었다. 
+- 이를 딱하게 여긴 문석이는 경민이를 위해 메모장에서 비밀번호를 찾는 프로그램을 만들기로 결심하였다! 
+- 문석이를 도와 경민이의 메모장에서 비밀번호를 찾아주는 프로그램을 만들어보자.
+
+---
+
+## 입력
+- 첫째 줄에 저장된 사이트 주소의 수 N(1 ≤ N ≤ 100,000)과 비밀번호를 찾으려는 사이트 주소의 수 M(1 ≤ M ≤ 100,000)이 주어진다. 
+- 두번째 줄부터 N개의 줄에 걸쳐 각 줄에 사이트 주소와 비밀번호가 공백으로 구분되어 주어진다. 
+  - 사이트 주소는 알파벳 소문자, 알파벳 대문자, 대시('-'), 마침표('.')로 이루어져 있고, 
+  - 중복되지 않는다. 
+  - 비밀번호는 알파벳 대문자로만 이루어져 있다. 
+  - 모두 길이는 최대 20자이다.
+- N+2번째 줄부터 M개의 줄에 걸쳐 비밀번호를 찾으려는 사이트 주소가 한줄에 하나씩 입력된다. 
+  - 이때, 반드시 이미 저장된 사이트 주소가 입력된다.
+
+---
+
+## 출력
+첫 번째 줄부터 M개의 줄에 걸쳐 비밀번호를 찾으려는 사이트 주소의 비밀번호를 차례대로 각 줄에 하나씩 출력한다.
+
+---
+
+## 예제 입력
+```markdown
+16 4
+noj.am IU
+acmicpc.net UAENA
+startlink.io THEKINGOD
+google.com ZEZE
+nate.com VOICEMAIL
+naver.com REDQUEEN
+daum.net MODERNTIMES
+utube.com BLACKOUT
+zum.com LASTFANTASY
+dreamwiz.com RAINDROP
+hanyang.ac.kr SOMEDAY
+dhlottery.co.kr BOO
+duksoo.hs.kr HAVANA
+hanyang-u.ms.kr OBLIVIATE
+yd.es.kr LOVEATTACK
+mcc.hanyang.ac.kr ADREAMER
+startlink.io
+acmicpc.net
+noj.am
+mcc.hanyang.ac.kr
+```
+
+## 예제 출력
+```markdown
+THEKINGOD
+UAENA
+IU
+ADREAMER
+```
\ No newline at end of file
diff --git a/out/production/algorithm-study/main/java/week02/boj1764/problem.md b/out/production/algorithm-study/main/java/week02/boj1764/problem.md
new file mode 100644
index 0000000..50769d2
--- /dev/null
+++ b/out/production/algorithm-study/main/java/week02/boj1764/problem.md
@@ -0,0 +1,39 @@
+# [듣보잡](https://www.acmicpc.net/problem/1764)
+
+## 문제
+- 김진영이 듣도 못한 사람의 명단과, 보도 못한 사람의 명단이 주어질 때, 
+- 듣도 보도 못한 사람의 명단을 구하는 프로그램을 작성하시오.
+
+---
+
+## 입력
+- 첫째 줄에 듣도 못한 사람의 수 N, 보도 못한 사람의 수 M이 주어진다. 
+- 이어서 둘째 줄부터 N개의 줄에 걸쳐 듣도 못한 사람의 이름과, N+2째 줄부터 보도 못한 사람의 이름이 순서대로 주어진다. 
+- 이름은 띄어쓰기 없이 알파벳 **소문자로만** 이루어지며, 그 길이는 20 이하이다. N, M은 **500,000 이하의 자연수**이다.
+- 듣도 못한 사람의 명단에는 **중복되는 이름이 없으며**, 보도 못한 사람의 명단도 마찬가지이다.
+
+---
+
+## 출력
+- 듣보잡의 수와 그 명단을 **사전순으로 출력**한다.
+
+---
+
+## 예제 입력
+```markdown
+3 4
+ohhenrie
+charlie
+baesangwook
+obama
+baesangwook
+ohhenrie
+clinton
+```
+
+## 예제 출력
+```markdown
+2
+baesangwook
+ohhenrie
+```
\ No newline at end of file
diff --git a/out/production/algorithm-study/main/java/week02/pgs42576/README.md b/out/production/algorithm-study/main/java/week02/pgs42576/README.md
new file mode 100644
index 0000000..e26896d
--- /dev/null
+++ b/out/production/algorithm-study/main/java/week02/pgs42576/README.md
@@ -0,0 +1,89 @@
+# Map의 메서드 (Java 8+)
+- `putIfAbsent(K key, V value)`
+  - Key가 존재할 경우: Value 변경 없이 기존에 존재하는 Key의 Value를 반환한다.
+  - Key가 존재하지 않는 경우: Key에 해당하는 Value를 저장한 후 null을 반환한다.
+  - 예시)
+    - `Map<String, Integer>`에 `key = "A", value = 5`인 데이터를 `put`한다.
+    - `map.putIfAbsent("A", 10)` : Key가 이미 존재하기 때문에 Value의 수정 없이 5를 반환한다.
+    - `map.putIfAbsent("B", 5)` : Key가 존재하지 않기 때문에 5를 저장한 후 null을 반환한다.
+
+
+- `compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction)`
+  - Key의 여부와 관계 없이 전달받은 인자를 통해 람다 함수를 적용하고, 결과에 따라 key를 제거하거나, 새로운 value를 저장한다.
+  - Key가 존재하지 않을 경우 NPE(NullPointerException)이 발생할 수 있기 때문에 연산을 하기 전 값을 체크해주는 것이 좋다.
+  - 예시)
+    - `Map<String, Integer>`에 `key = "A", value = 5`, `key = "B", value = 10`인 데이터를 `put`한다.
+    - `map.compute("A", (k, v) -> v == null ? 15 : v + 5)` : Key가 A인 Value가 5로 존재하므로, 5를 더한 10으로 저장한다.
+    - `map.compute("C", (k, v) -> v == null ? 15 : v + 5)` : Key가 C인 Value는 존재하지 않으므로, 15를 저장한다.
+
+
+> BiFunction?\
+`Function(T, R)`은 매개변수를 하나 가지고, 매개변수와 같거나 다른 타입을 반환할 수 있는데, 여기에 `Bi` 가 붙은 것이다.\
+`BiFunction(T, U, R)`은 매개변수를 두 개 가지고, 매개변수와 같거나 다른 타입을 반환할 수 있다.
+>
+
+- `computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction)`
+  - Key가 존재할 경우: 아무런 작업을 하지 않고 기존에 존재하는 Key의 Value를 반환한다.
+  - Key가 존재하지 않는 경우: 람다식을 적용한 값을 해당 Key에 저장한 후 newValue를 반환한다.
+  - 예시)
+    - `Map<Integer, String>`에 `key = 1, value = "One"`, `key = 2, value = "Two"`인 데이터를 `put`한다.
+    - `map.computeIfAbsent(1, k -> "NewOne")` : Key가 1인 Value는 이미 존재하므로 기존 값인 One을 반환한다.
+    - `map.computeIfAbsent(3, k -> "Three")` : Key가 3인 Value는 존재하지 않으므로 Three를 저장 후 반환한다.
+
+
+- `computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction)`
+  - Key가 존재할 경우: 람다식을 적용한 값이 null이 아니면 해당 Key에 저장한 후 반환하고, null이면 Key를 제거한 후 null을 반환한다.
+  - Key가 존재하지 않는 경우: null을 반환한다.
+  - 예시)
+    - `Map<String, Integer>`에 `key = "A", value = 100`, `key = "B", value = 200`인 데이터를 `put`한다.
+    - `map.computeIfPresent("A", (k, v) -> v + 50)` : Key가 A인 Value는 100이 존재하므로 50을 더한 150을 반환한다.
+    - `map.computeIfPresent("B", (k, v) -> null)` : Key가 B인 Value가 null이 되면서 Key를 제거하고 null을 반환한다.
+    - `map.computeIfPresent("C", (k, v) -> v + 10)` : Key가 C인 Value가 존재하지 않으므로 null을 반환한다.
+
+
+- `getOrDefault(Object key, V defaultValue)`
+  - Key가 존재할 경우: Key에 존재하는 Value를 반환한다.
+  - Key가 존재하지 않는 경우: 두 번째 인자로 설정한 defaultValue를 반환한다.
+  - 예시)
+    - `Map<String, String>`에 `key = "A", value = "Apple"`인 데이터를 `put`한다.
+    - `map.getOrDefault("A", "Default")` : Key가 A인 Value가 존재하므로 그 값인 Apple을 반환한다.
+    - `map.getOrDefault("B", "Default")` : Key가 B인 Value가 존재하지 않으므로 Default를 반환한다.
+---
+# 완주하지 못한 선수
+- 단 한 명의 선수를 제외하고는 모든 선수가 마라톤을 완주하였습니다.
+- 마라톤에 참여한 선수들의 이름이 담긴 배열 `participant`와 완주한 선수들의 이름이 담긴 배열 `completion`이 주어진다.
+- 완주하지 못한 선수의 이름을 return 하도록 solution 함수를 작성한다.
+- completion의 길이는 participant의 길이보다 1 작다.
+- 참가자 중에는 동명이인이 있을 수 있다.
+
+- 예시
+  - `String[] participant = {"leo", "kiki", "eden"};`
+  - `String[] completion = {"kiki", "eden"};`
+
+
+```java
+for (String participantName : participant) {
+        map.compute(participantName, (k, v) -> v == null ? 1 : v + 1);
+    }
+```
+- participant(참가자) 배열을 순회하면서 key로 조회하고, value가 null일 경우 1, value가 있을 경우 기존 값에 1을 더해준다.
+- {"leo": 1, "kiki": 1, "eden": 1}
+
+ 
+```java
+for (String completionName : completion) {
+        map.compute(completionName, (k, v) -> v == null ? 0 : v - 1);
+    }
+```
+- completion(완주자) 배열을 순회하면서 key로 조회하고, value가 null일 경우 0, value가 있을 경우 기존 값에서 1을 뺀다.
+- {"leo": 1, "kiki": 0, "eden": 0}
+
+```java
+for (String name : map.keySet()) {
+            if (map.get(name) != 0) {
+                return name;
+            }
+    }
+    return "";
+```
+- completion(완주자)의 길이는 participant(참가자)의 길이보다 1 작기 때문에 key를 통해 값을 조회하면 0이 아닌 값은 1개만 남는다. 
\ No newline at end of file
diff --git a/out/production/algorithm-study/main/java/week02/pgs42577/problem.md b/out/production/algorithm-study/main/java/week02/pgs42577/problem.md
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index 0000000..c213a50
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+++ b/out/production/algorithm-study/main/java/week02/pgs42577/problem.md
@@ -0,0 +1,34 @@
+# [전화번호 목록](https://school.programmers.co.kr/learn/courses/30/lessons/42577)
+
+## 문제
+- 전화번호부에 적힌 전화번호 중, 한 번호가 다른 번호의 접두어인 경우가 있는지 확인하려 합니다. 
+- 전화번호가 다음과 같을 경우, 구조대 전화번호는 영석이의 전화번호의 접두사입니다.
+  - 구조대 : 119
+  - 박준영 : 97 674 223
+  - 지영석 : 11 9552 4421
+- 전화번호부에 적힌 전화번호를 담은 배열 phone_book 이 solution 함수의 매개변수로 주어질 때, 
+  - 어떤 번호가 다른 번호의 접두어인 경우가 있으면 false를 
+  - 그렇지 않으면 true를 return 하도록 solution 함수를 작성해주세요.
+
+---
+
+## 제한 사항
+- phone_book의 길이는 1 이상 1,000,000 이하입니다.
+  - 각 전화번호의 길이는 1 이상 20 이하입니다.
+  - 같은 전화번호가 중복해서 들어있지 않습니다.
+
+---
+
+## 입출력 예제
+| phone_book                       | return |
+|----------------------------------|-------|
+| ["119", "97674223", "1195524421"] | false |
+| ["123","456","789"]              | true  |
+| ["12","123","1235","567","88"]   | false |
+
+--
+
+## 채점 결과
+- 정확성: 83.3
+- 효율성: 16.7
+- 합계: 100.0 / 100.0
\ No newline at end of file
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+1. 옷의 종류가 다음과 같이 있다고 가정
+- ["yellow_hat", "headgear"]
+- ["blue_sunglasses", "eyewear"]
+- ["green_turban", "headgear"]
+
+2. 해당 옷을 입는경우와 안입는 경우 두가지 경우의 수를 만듦
+
+3. 의상 문제 조합 원리
+- 각 의상 종류별로 입을 수 있는 옷의 개수를 센다.
+- 예를 들어, headgear 종류가 2개라면, headgear를 입는 경우는 2가지, 입지 않는 경우도 1가지(아무것도 안 입음)이 있다.
+- 따라서 headgear에 대한 경우의 수는 (2 + 1) = 3이 된다.
+- 모든 의상 종류에 대해 같은 방식으로 (옷 개수 + 1)을 곱해준다.
+- 마지막에 1을 빼는 이유는, "아무것도 입지 않은 경우"를 제외하기 위해서이다.
+  - 즉, 모든 종류에서 아무것도 입지 않는 경우는 조합에 포함시키지 않으므로 -1을 해준다.
+
+### 예시
+
+- 의상 종류별 옷 개수:
+  - headgear: 2개 ("yellow_hat", "green_turban")
+  - eyewear: 1개 ("blue_sunglasses")
+
+- 경우의 수 계산
+  1. headgear 경우의 수 = 2 + 1 = 3 (두 가지 옷 중 하나를 입거나 아무것도 안 입는 경우)
+  2. eyewear 경우의 수 = 1 + 1 = 2 (한 가지 옷을 입거나 안 입는 경우)
+
+- 전체 경우의 수 = 3 * 2 = 6
+
+- 여기서 아무것도 입지 않은 경우(머리도 안 쓰고, 안경도 안 씀)를 빼줘야 하므로,
+  - 최종 경우의 수 = 6 - 1 = 5
+
+| headgear 선택 | eyewear 선택 | 비고 |
+|---------------|---------------|------|
+| yellow_hat    | blue_sunglasses | ✅ |
+| green_turban  | blue_sunglasses | ✅ |
+| yellow_hat    | 안 입음 | ✅ |
+| green_turban  | 안 입음 | ✅ |
+| 안 입음 | blue_sunglasses | ✅ |
+| 안 입음 | 안 입음 | 🚫 (모두 안 입음 → 제외) |
+
+```markdown
+# 전체 경우의 수 목록 예시
+1. yellow_hat
+2. green_turban
+3. blue_sunglasses
+4. yellow_hat + blue_sunglasses
+5. green_turban + blue_sunglasses
+```
+
+- 따라서, 옷을 조합하여 입는 모든 경우의 수는 5가지가 된다.
\ No newline at end of file
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+# 문제
+괄호 문자열(Parenthesis String, PS)은 두 개의 괄호 기호인 ‘(’ 와 ‘)’ 만으로 구성되어 있는 문자열이다.
+그 중에서 괄호의 모양이 바르게 구성된 문자열을 올바른 괄호 문자열(Valid PS, VPS)이라고 부른다.
+한 쌍의 괄호 기호로 된 “( )” 문자열은 기본 VPS 이라고 부른다.
+만일 x 가 VPS 라면 이것을 하나의 괄호에 넣은 새로운 문자열 “(x)”도 VPS 가 된다.
+그리고 두 VPS x 와 y를 접합(concatenation)시킨 새로운 문자열 xy도 VPS 가 된다.
+예를 들어 “(())()”와 “((()))” 는 VPS 이지만 “(()(”, “(())()))” , 그리고 “(()” 는 모두 VPS 가 아닌 문자열이다.
+입력으로 주어진 괄호 문자열이 VPS 인지 아닌지를 판단해서 그 결과를 YES 와 NO 로 나타내어야 한다.
+
+# 입력
+입력은 T개의 테스트 데이터로 주어진다.
+입력의 첫 번째 줄에는 입력 데이터의 수를 나타내는 정수 T가 주어진다.
+각 테스트 데이터의 첫째 줄에는 괄호 문자열이 한 줄에 주어진다.
+하나의 괄호 문자열의 길이는 2 이상 50 이하이다.
+만일 입력 괄호 문자열이 올바른 괄호 문자열(VPS)이면 “YES”, 아니면 “NO”를 한 줄에 하나씩 차례대로 출력해야 한다.
+
+---
+# 풀이
+- '(' 와 ')' 는 한 세트이다.
+- '(' 가 등장한 경우 stack에 넣어주기만 한다. (push)
+- ')' 가 등장한 경우 stack이 비었는지 확인한다.
+  - stack이 비었다면 짝이 맞지 않다. (VPS가 아니다.) -> NO
+  - stack이 비지 않았다면 짝을 맞춰주기 위해 스택에서 '(' 를 하나 제거한다. (pop)
+- 반복문에서 출력하지 않고 StringBuilder에 append 해주기 위해 boolean 값으로 판별
+- 마지막까지 확인한 뒤 스택이 비었거나, boolean 값이 true 라면 YES, 비어있지 않다면 짝이 맞지 않으므로 NO
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+# 문제
+1번부터 N번까지 N명의 사람이 원을 이루면서 앉아있고, 양의 정수 K(≤ N)가 주어진다. 
+이제 순서대로 K번째 사람을 제거한다.
+한 사람이 제거되면 남은 사람들로 이루어진 원을 따라 이 과정을 계속해 나간다.
+이 과정은 N명의 사람이 모두 제거될 때까지 계속된다.
+원에서 사람들이 제거되는 순서를 (N, K)-요세푸스 순열이라고 한다.
+예를 들어 (7, 3)-요세푸스 순열은 <3, 6, 2, 7, 5, 1, 4>이다.
+
+N과 K가 주어지면 (N, K)-요세푸스 순열을 구하는 프로그램을 작성하시오.
+
+<입력>
+첫째 줄에 N과 K가 빈 칸을 사이에 두고 순서대로 주어진다. (1 ≤ K ≤ N ≤ 1,000)
+
+<출력>
+예제와 같이 요세푸스 순열을 출력한다.
+
+<예제 입력> 7 3
+<예제 출력> <3, 6, 2, 7, 5, 1, 4>
+
+---
+
+# 풀이
+- 큐에 들어있는 수를 계속해서 반복해야 하기 때문에 선택되지 않은 수는 다시 큐의 제일 뒤로 들어간다.
+- 예)
+  - round1
+    - loop1. {1, 2, 3, 4, 5, 6, 7} -> {2, 3, 4, 5, 6, 7, 1} / 결과 {}
+    - loop2. {2, 3, 4, 5, 6, 7, 1} -> {3, 4, 5, 6, 7, 1, 2} / 결과 {}
+    - loop3. {3, 4, 5, 6, 7, 1, 2} -> {4, 5, 6, 7, 1, 2} / 결과 {3}
+  
+  - round2
+    - loop1. {4, 5, 6, 7, 1, 2} -> {5, 6, 7, 1, 2, 4} / 결과 {3}
+    - loop2. {5, 6, 7, 1, 2, 4} -> {6, 7, 1, 2, 4, 5} / 결과 {3}
+    - loop3. {6, 7, 1, 2, 4, 5} -> {7, 1, 2, 4, 5} / 결과 {3, 6}
+  
+  - round3
+    - loop1. {7, 1, 2, 4, 5} -> {1, 2, 4, 5, 7} / 결과 {3, 6}
+    - loop2. {1, 2, 4, 5, 7} -> {2, 4, 5, 7, 1} / 결과 {3, 6}
+    - loop3. {2, 4, 5, 7, 1} -> {4, 5, 7, 1} / 결과 {3, 6, 2}  
+  
+  - round4
+    - loop1. {4, 5, 7, 1} -> {5, 7, 1, 4} / 결과 {3, 6, 2}
+    - loop2. {5, 7, 1, 4} -> {7, 1, 4, 5} / 결과 {3, 6, 2}
+    - loop3. {7, 1, 4, 5} -> {1, 4, 5} / 결과 {3, 6, 2, 7}  
+  
+  - round5
+    - loop1. {1, 4, 5} -> {4, 5, 1} / 결과 {3, 6, 2, 7}
+    - loop2. {4, 5, 1} -> {5, 1, 4} / 결과 {3, 6, 2, 7}
+    - loop3. {5, 1, 4} -> {1, 4} / 결과 {3, 6, 2, 7, 5}  
+  
+  - round6
+    - loop1. {1, 4} -> {4, 1} / 결과 {3, 6, 2, 7, 5}
+    - loop2. {4, 1} -> {1, 4} / 결과 {3, 6, 2, 7, 5}
+    - loop3. {1, 4} -> {4} / 결과 {3, 6, 2, 7, 5, 1}  
+  
+  - round7
+    - 값이 하나만 남았기 때문에 루프를 돌지 않고 바로 결과값에 추가한다.
\ No newline at end of file
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