diff --git a/container-with-most-water/daiyongg-kim.py b/container-with-most-water/daiyongg-kim.py
new file mode 100644
index 0000000000..92330faf3a
--- /dev/null
+++ b/container-with-most-water/daiyongg-kim.py
@@ -0,0 +1,12 @@
+class Solution:
+    def maxArea(self, height: List[int]) -> int:
+        left = 0
+        right = len(height) - 1
+        max_area = 0
+        while left < right:
+            max_area = max(max_area, min(height[left], height[right]) * (right - left))
+            if height[left] < height[right]:
+                left += 1
+            else:
+                right -= 1
+        return max_area
diff --git a/design-add-and-search-words-data-structure/daiyongg-kim.py b/design-add-and-search-words-data-structure/daiyongg-kim.py
new file mode 100644
index 0000000000..c37c0eb174
--- /dev/null
+++ b/design-add-and-search-words-data-structure/daiyongg-kim.py
@@ -0,0 +1,42 @@
+class TrieNode():
+    def __init__(self):
+        self.children = {}
+        self.word = False
+
+class WordDictionary:
+
+    def __init__(self):
+        self.root = TrieNode()
+        
+    def addWord(self, word: str) -> None:
+        curr = self.root
+        for c in word:
+            if c not in curr.children:
+                curr.children[c] = TrieNode()
+            curr = curr.children[c]
+        curr.word = True
+
+    def search(self, word: str) -> bool:
+        
+        def dfs(j, root):
+            curr = root
+            
+            for i in range(j, len(word)):
+                c = word[i]
+
+                if c == ".":
+                    for child in curr.children.values():
+                        if dfs(i+1, child):
+                            return True
+                    return False
+                else :
+                    if c not in curr.children:
+                        return False
+                    curr = curr.children[c]
+            return curr.word
+        return dfs(0, self.root)
+
+# Your WordDictionary object will be instantiated and called as such:
+# obj = WordDictionary()
+# obj.addWord(word)
+# param_2 = obj.search(word)
diff --git a/longest-increasing-subsequence/daiyongg-kim.py b/longest-increasing-subsequence/daiyongg-kim.py
new file mode 100644
index 0000000000..07bca42a81
--- /dev/null
+++ b/longest-increasing-subsequence/daiyongg-kim.py
@@ -0,0 +1,14 @@
+class Solution:
+    def lengthOfLIS(self, nums: List[int]) -> int:
+        if not nums:
+            return 0
+        
+        # 모든 위치에서 최소 길이는 1 (자기 자신)
+        dp = [1] * len(nums)
+        
+        for i in range(len(nums)):
+            for j in range(i):
+                if nums[i] > nums[j]:
+                    dp[i] = max(dp[i], dp[j] + 1)
+        
+        return max(dp)
diff --git a/spiral-matrix/daiyongg-kim.py b/spiral-matrix/daiyongg-kim.py
new file mode 100644
index 0000000000..0b752821ef
--- /dev/null
+++ b/spiral-matrix/daiyongg-kim.py
@@ -0,0 +1,27 @@
+class Solution:
+    def spiralOrder(self, matrix: List[List[int]]) -> List[int]:
+        res = []
+        left, right = 0, len(matrix[0])
+        top, bottom = 0, len(matrix)
+
+        while left < right and top < bottom:
+            for i in range(left, right):
+                res.append(matrix[top][i])
+            top += 1
+
+            for i in range(top, bottom):
+                res.append(matrix[i][right - 1])
+            right -= 1
+
+            if not (left < right and top < bottom):
+                break
+
+            for i in range(right -1, left -1, -1):
+                res.append(matrix[bottom - 1][i])
+            bottom -= 1
+            
+            for i in range(bottom - 1, top - 1, -1):
+                res.append(matrix[i][left])
+            left += 1
+
+        return res
diff --git a/valid-parentheses/daiyongg-kim.py b/valid-parentheses/daiyongg-kim.py
new file mode 100644
index 0000000000..f5bf821b7c
--- /dev/null
+++ b/valid-parentheses/daiyongg-kim.py
@@ -0,0 +1,22 @@
+class Solution:
+    def isValid(self, s: str) -> bool:
+        stack = []
+
+        for c in s:
+            if c == '(' or c == '[' or c == '{':
+                stack.append(c)
+            else:
+                if not stack:
+                    return False
+                
+                cur = stack.pop()
+                if cur == '(' and c != ')':
+                    return False
+                if cur == '{' and c != '}':
+                    return False
+                if cur == '[' and c != ']':
+                    return False
+        if not stack:
+            return True
+        else:
+            return False