diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..19c6520
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++ 활성 파일 빌드",
+            "command": "/usr/bin/g++",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}/${fileBasenameNoExtension}"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "디버거에서 생성된 작업입니다."
+        }
+    ],
+    "version": "2.0.0"
+}
\ No newline at end of file
diff --git a/w1/README.md b/w1/README.md
index 92e5ce4..9306eea 100644
--- a/w1/README.md
+++ b/w1/README.md
@@ -1 +1,2 @@
 여기에 1주차 과제를 작성해주시면 됩니다!
+이번 강의를 통해 다음 학기에 배우게 될 자료구조에 등장하는 어려운 개념에 대해 강사님의 접근법을 사전에 배워서 다음학기에 자료구조 수업을 조금 수월하게 이수할 수 있기를 희망합니다. 
\ No newline at end of file
diff --git a/w1/test b/w1/test
new file mode 100755
index 0000000..e99ae59
Binary files /dev/null and b/w1/test differ
diff --git a/w1/test.dSYM/Contents/Info.plist b/w1/test.dSYM/Contents/Info.plist
new file mode 100644
index 0000000..9a0e661
--- /dev/null
+++ b/w1/test.dSYM/Contents/Info.plist
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleIdentifier</key>
+		<string>com.apple.xcode.dsym.test</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundlePackageType</key>
+		<string>dSYM</string>
+		<key>CFBundleSignature</key>
+		<string>????</string>
+		<key>CFBundleShortVersionString</key>
+		<string>1.0</string>
+		<key>CFBundleVersion</key>
+		<string>1</string>
+	</dict>
+</plist>
diff --git a/w1/test.dSYM/Contents/Resources/DWARF/test b/w1/test.dSYM/Contents/Resources/DWARF/test
new file mode 100644
index 0000000..50cec14
Binary files /dev/null and b/w1/test.dSYM/Contents/Resources/DWARF/test differ
diff --git a/w1/test.dSYM/Contents/Resources/Relocations/aarch64/test.yml b/w1/test.dSYM/Contents/Resources/Relocations/aarch64/test.yml
new file mode 100644
index 0000000..8de8b68
--- /dev/null
+++ b/w1/test.dSYM/Contents/Resources/Relocations/aarch64/test.yml
@@ -0,0 +1,5 @@
+---
+triple:          'arm64-apple-darwin'
+binary-path:     '/Users/kwakminjun/SDC-datastructure/w1/test'
+relocations:     []
+...
diff --git a/w2/w2(linkedlist).py b/w2/w2(linkedlist).py
new file mode 100644
index 0000000..10f9ea7
--- /dev/null
+++ b/w2/w2(linkedlist).py
@@ -0,0 +1,67 @@
+import sys
+
+# 링크드 리스트 형태로 구현
+class Node:
+    def __init__(self, data):
+        self.data = data
+        self.next = None
+
+class LinkedStack:
+    def __init__(self):
+        self.top_node = None
+        self.current_size = 0
+
+    def push(self, x):
+        new_node = Node(x)
+        new_node.next = self.top_node
+        self.top_node = new_node
+        self.current_size += 1
+
+    def pop(self):
+        if self.empty_status():
+            return -1
+        
+        pop_data = self.top_node.data
+        self.top_node = self.top_node.next
+        self.current_size -= 1
+        return pop_data
+
+    def size(self):
+        return self.current_size
+
+    def empty_status(self):
+        return self.top_node is None
+
+    def top(self):
+        if self.empty_status():
+            return -1
+        return self.top_node.data
+
+def solve():
+    input = sys.stdin.read().splitlines()
+    if not input:
+        return
+
+    n = int(input[0])
+    stack = LinkedStack()
+    output = []
+
+    for i in range(1, n + 1):
+        command = input[i].split()
+        
+        if command[0] == "push":
+            stack.push(int(command[1]))
+        elif command[0] == "pop":
+            output.append(str(stack.pop()))
+        elif command[0] == "size":
+            output.append(str(stack.size()))
+        elif command[0] == "empty":
+            # 문제 조건에 따라 비어있으면 1, 아니면 0 출력
+            output.append("1" if stack.empty_status() else "0")
+        elif command[0] == "top":
+            output.append(str(stack.top()))
+
+    sys.stdout.write("\n".join(output) + "\n")
+
+if __name__ == "__main__":
+    solve()
\ No newline at end of file
diff --git a/w2/w2(list).py b/w2/w2(list).py
new file mode 100644
index 0000000..c5a95e4
--- /dev/null
+++ b/w2/w2(list).py
@@ -0,0 +1,56 @@
+import sys
+
+# 강의 자료의 배열 형태 구현
+class Stack:
+    def __init__(self):
+       
+        self.items = []
+
+    def push(self, x):
+        
+        self.items.append(x)
+
+    def pop(self):
+        if self.empty():
+            return -1
+        return self.items.pop()
+
+    def size(self):
+        return len(self.items)
+
+    def empty(self):
+        return 1 if not self.items else 0
+
+    def top(self):
+        if self.empty():
+            return -1
+        return self.items[-1]
+
+
+def solve():
+    input_data = sys.stdin.read().splitlines()
+    if not input_data:
+        return
+
+    n = int(input_data[0])
+    stack = Stack()
+    results = []
+
+    for i in range(1, n + 1):
+        command = input_data[i].split()
+        
+        if command[0] == "push":
+            stack.push(int(command[1]))
+        elif command[0] == "pop":
+            results.append(str(stack.pop()))
+        elif command[0] == "size":
+            results.append(str(stack.size()))
+        elif command[0] == "empty":
+            results.append(str(stack.empty()))
+        elif command[0] == "top":
+            results.append(str(stack.top()))
+
+    sys.stdout.write("\n".join(results) + "\n")
+
+if __name__ == "__main__":
+    solve()
\ No newline at end of file
diff --git a/w4/w4.py b/w4/w4.py
new file mode 100644
index 0000000..b32e0a7
--- /dev/null
+++ b/w4/w4.py
@@ -0,0 +1,77 @@
+
+class Node:
+    def __init__(self, data):
+        self.data = data
+        self.left = None   
+        self.right = None  
+
+
+class BinaryTree:
+    def __init__(self):
+        self.nodes = {}
+
+    
+    def get_node(self, data):
+        if data == '.':
+            return None
+        if data not in self.nodes:
+            self.nodes[data] = Node(data)
+        return self.nodes[data]
+
+    
+    def preorder(self, node):
+        if node:
+            print(node.data, end='')
+            self.preorder(node.left)
+            self.preorder(node.right)
+
+    
+    def inorder(self, node):
+        if node:
+            self.inorder(node.left)
+            print(node.data, end='')
+            self.inorder(node.right)
+
+    
+    def postorder(self, node):
+        if node:
+            self.postorder(node.left)
+            self.postorder(node.right)
+            print(node.data, end='')
+
+
+def solve():
+    import sys
+    
+    input_data = sys.stdin.read().split()
+    if not input_data:
+        return
+    
+    n = int(input_data[0])
+    tree = BinaryTree()
+    
+    
+    idx = 1
+    for _ in range(n):
+        root_data = input_data[idx]
+        left_data = input_data[idx+1]
+        right_data = input_data[idx+2]
+        
+        parent = tree.get_node(root_data)
+        parent.left = tree.get_node(left_data)
+        parent.right = tree.get_node(right_data)
+        idx += 3
+
+    
+    root_node = tree.nodes['A']
+
+    # 결과
+    tree.preorder(root_node)
+    print()
+    tree.inorder(root_node)
+    print()
+    tree.postorder(root_node)
+    print()
+
+if __name__ == "__main__":
+    solve()
\ No newline at end of file