diff --git a/aiden/week_4/boj_10886.py b/aiden/week_4/boj_10886.py
new file mode 100644
index 0000000..0fe14da
--- /dev/null
+++ b/aiden/week_4/boj_10886.py
@@ -0,0 +1,31 @@
+from collections import deque
+import sys
+input=sys.stdin.readline
+
+def output(command):
+    cmd = command[0]
+    if cmd == 'push_front':
+        mydeq.appendleft(int(command[1]))
+    elif cmd == 'push_back':
+        mydeq.append(int(command[1]))
+    elif cmd == 'pop_front':
+        return mydeq.popleft() if mydeq else -1
+    elif cmd == 'pop_back':
+        return mydeq.pop() if mydeq else -1
+    elif cmd == 'size':
+        return len(mydeq)
+    elif cmd == 'empty':
+        return 1 if not mydeq else 0
+    elif cmd == 'front':
+        return mydeq[0] if mydeq else -1
+    elif cmd == 'back':
+        return mydeq[-1] if mydeq else -1
+
+N = int(input())
+mydeq = deque()
+
+for i in range(N):
+    command = input().split()
+    result = output(command)
+    if result is not None:
+        print(result)
\ No newline at end of file
diff --git a/aiden/week_4/boj_11279.py b/aiden/week_4/boj_11279.py
new file mode 100644
index 0000000..f9d6f52
--- /dev/null
+++ b/aiden/week_4/boj_11279.py
@@ -0,0 +1,16 @@
+import heapq
+import sys
+input = sys.stdin.readline
+
+N = int(input())
+heap = []
+
+for _ in range(N):
+    x = int(input().strip())
+    if x != 0:
+        heapq.heappush(heap, -x)
+    else:
+        if heap:
+            print(-heapq.heappop(heap))
+        else:
+            print(0)
\ No newline at end of file
diff --git a/aiden/week_4/boj_15828.py b/aiden/week_4/boj_15828.py
new file mode 100644
index 0000000..205482d
--- /dev/null
+++ b/aiden/week_4/boj_15828.py
@@ -0,0 +1,25 @@
+N = int(input())
+packet = []
+
+while True:
+    p = int(input())
+    if p == -1:
+        break
+    packet.append(p)
+
+q1 = []
+
+for i in packet:
+    if i == 0:
+        if q1:  # 리스트가 비어있지 않은 경우에만 요소 제거
+            q1.pop(0)
+    else:
+        if len(q1) < N:  # 큐가 가득 차지 않았을 때만 요소 추가
+            q1.append(i)
+
+# 큐에 남아 있는 값 모두 출력하기
+if q1:
+    print(' '.join(map(str, q1)))
+else:
+    print('empty')
+
diff --git a/aiden/week_4/boj_1874.py b/aiden/week_4/boj_1874.py
new file mode 100644
index 0000000..2e006f5
--- /dev/null
+++ b/aiden/week_4/boj_1874.py
@@ -0,0 +1,47 @@
+class Stack:
+    def __init__(self):
+        self.box = []
+        self.output = []  # 출력을 저장하기 위한 리스트
+
+    def push(self, item):
+        self.box.append(item)
+        self.output.append('+')  # 리스트에 출력 저장
+        
+    def pop(self):
+        self.box.pop()
+        self.output.append('-')  # 리스트에 출력 저장
+    
+    def size(self):
+        return len(self.box)
+    
+    def is_empty(self):
+        return len(self.box) == 0
+    
+    def peek(self):
+        if not self.is_empty():
+            return self.box[-1]
+        return None
+    
+n = int(input())
+integer = [int(input()) for _ in range(n)]
+stack = Stack()
+
+current = 1  
+possible = True  # 수열을 만들 수 있는지 여부를 저장
+
+for number in integer:
+    while current <= number:
+        stack.push(current)
+        current += 1
+    
+    if stack.peek() == number:
+        stack.pop()
+    else:
+        possible = False
+        break
+
+if possible:
+    for op in stack.output:  # 저장된 출력 리스트에서 출력
+        print(op)
+else:
+    print("NO")
\ No newline at end of file
diff --git a/aiden/week_4/boj_2075.py b/aiden/week_4/boj_2075.py
new file mode 100644
index 0000000..2d575ae
--- /dev/null
+++ b/aiden/week_4/boj_2075.py
@@ -0,0 +1,20 @@
+import heapq
+import sys
+input = sys.stdin.readline
+
+N = int(input())
+heap = []
+
+# 처음 N개의 숫자를 힙에 넣음
+for _ in range(N):
+    numbers = list(map(int, input().split()))
+    for number in numbers:
+        if len(heap) < N:
+            heapq.heappush(heap, number)
+        else:
+            # 현재 힙의 루트(최솟값)보다 큰 경우에만 힙에 삽입
+            if number > heap[0]:
+                heapq.heappushpop(heap, number)
+
+# 마지막에 남은 힙의 루트가 N번째로 큰 값
+print(heap[0])
\ No newline at end of file
diff --git a/aiden/week_4/boj_4949.py b/aiden/week_4/boj_4949.py
new file mode 100644
index 0000000..8434d14
--- /dev/null
+++ b/aiden/week_4/boj_4949.py
@@ -0,0 +1,46 @@
+class Stack:
+    def __init__(self):
+        self.box = []
+
+    def push(self, item):
+        self.box.append(item)
+
+    def pop(self):
+        return self.box.pop()
+    
+    def size(self):
+        return len(self.box)
+    
+    def is_empty(self):
+        return len(self.box) == 0
+    
+    def peek(self):
+        if not self.is_empty():
+            return self.box[-1]
+        return None
+    
+def bracket(string):
+    stack = Stack()
+    for ch in string:
+        if ch in '([':
+            stack.push(ch)
+        elif ch == ')':
+            if stack.is_empty() or stack.peek() != '(':
+                return False
+            stack.pop()
+        elif ch == ']':
+            if stack.is_empty() or stack.peek() != '[':
+                return False
+            stack.pop()
+    return stack.is_empty()
+
+while True:
+    string = input().rstrip()
+    
+    if string == ".":
+        break
+
+    if bracket(string):
+        print("yes")
+    else:
+        print("no")
\ No newline at end of file
diff --git a/aiden/week_4/boj_5430.py b/aiden/week_4/boj_5430.py
new file mode 100644
index 0000000..bdd6875
--- /dev/null
+++ b/aiden/week_4/boj_5430.py
@@ -0,0 +1,28 @@
+def parse_list_strings(arr):
+    if arr == "[]":
+        return []
+    return list(map(int, arr.strip('[]').split(',')))
+
+T = int(input())
+
+for _ in range(T):
+    count = 0
+    p = input()
+    n = int(input())
+    arr = parse_list_strings(input())
+    
+    for i in p:
+        if i == 'R':
+            count += 1
+        elif i == 'D':
+            if not arr:
+                print('error')
+                break
+            if count % 2 == 0:
+                arr.pop(0)
+            else:
+                arr.pop(-1)
+    else:
+        if count % 2 != 0:
+            arr.reverse()
+        print(f"[{','.join(map(str, arr))}]")