LeetCode Solutions

此repo收錄我早期在 LeetCode 上練習演算法題目時的解題紀錄與程式碼整理。

因為一開始是在 VS Code 中完成題目並上傳至 GitHub，但後來因為直接用leetcode網站寫完並提交比較方便，因此這裡只有我早期寫的題目。

本 repo 用於：

紀錄演算法與資料結構的學習進度
保留重要題目的解法與思考方式
作為未來面試時程式實作能力的展現

🏷 Topics Covered

Array / Hash Table
Two Pointers
Linked List
Tree / Binary Tree / BST
Dynamic Programming
Backtracking
Graph / DFS / BFS
Greedy
Heap / Priority Queue
Sliding Window
Math / Bit Manipulation

Name		Name	Last commit message	Last commit date
.vscode		.vscode
1. Two Sum		1. Two Sum
1		1
100. Same Tree		100. Same Tree
102. Binary Tree Level Order Traversal		102. Binary Tree Level Order Traversal
104. Maximum Depth of Binary Tree		104. Maximum Depth of Binary Tree
1046. Last Stone Weight		1046. Last Stone Weight
105. Construct Binary Tree from Preorder and Inorder Traversal		105. Construct Binary Tree from Preorder and Inorder Traversal
11. Container With Most Water		11. Container With Most Water
110. Balanced Binary Tree		110. Balanced Binary Tree
1137. N-th Tribonacci Number		1137. N-th Tribonacci Number
118. Pascal's Triangle		118. Pascal's Triangle
121. Best Time to Buy and Sell Stock		121. Best Time to Buy and Sell Stock
124. Binary Tree Maximum Path Sum		124. Binary Tree Maximum Path Sum
125. Valid Palindrome		125. Valid Palindrome
127. Word Ladder		127. Word Ladder
128. Longest Consecutive Sequence		128. Longest Consecutive Sequence
129. Sum Root to Leaf Numbers		129. Sum Root to Leaf Numbers
1299. Replace Elements with Greatest Element on Right Side		1299. Replace Elements with Greatest Element on Right Side
130. Surrounded Regions		130. Surrounded Regions
131. Palindrome Partitioning		131. Palindrome Partitioning
133. Clone Graph		133. Clone Graph
134. Gas Station		134. Gas Station
138. Copy List with Random Pointer		138. Copy List with Random Pointer
139. Word Break		139. Word Break
14. Longest Common Prefix		14. Longest Common Prefix
141. Linked List Cycle		141. Linked List Cycle
143. Reorder List		143. Reorder List
1448. Count Good Nodes in Binary Tree		1448. Count Good Nodes in Binary Tree
146. LRU Cache		146. LRU Cache
1498. Number of Subsequences That Satisfy the Given Sum Condition		1498. Number of Subsequences That Satisfy the Given Sum Condition
15. 3Sum		15. 3Sum
150. Evaluate Reverse Polish Notation		150. Evaluate Reverse Polish Notation
152. Maximum Product Subarray		152. Maximum Product Subarray
153. Find Minimum in Rotated Sorted Array		153. Find Minimum in Rotated Sorted Array
155. Min Stack		155. Min Stack
1584. Min Cost to Connect All Points		1584. Min Cost to Connect All Points
167. Two Sum II - Input Array Is Sorted		167. Two Sum II - Input Array Is Sorted
17. Letter Combinations of a Phone Number		17. Letter Combinations of a Phone Number
1768. Merge Strings Alternately		1768. Merge Strings Alternately
178. Graph Valid Tree copy		178. Graph Valid Tree copy
18. 4Sum		18. 4Sum
1838. Frequency of the Most Frequent Element		1838. Frequency of the Most Frequent Element
1846. Maximum Element After Decreasing and Rearranging		1846. Maximum Element After Decreasing and Rearranging
189. Rotate Array		189. Rotate Array
1899. Merge Triplets to Form Target Triplet		1899. Merge Triplets to Form Target Triplet
19. Remove Nth Node From End of List		19. Remove Nth Node From End of List
1929. Concatenation of Array		1929. Concatenation of Array
1968. Array With Elements Not Equal to Average of Neighbors		1968. Array With Elements Not Equal to Average of Neighbors
198. House Robber		198. House Robber
1984. Minimum Difference Between Highest and Lowest of K Scores		1984. Minimum Difference Between Highest and Lowest of K Scores
1985. Find the Kth Largest Integer in the Array		1985. Find the Kth Largest Integer in the Array
199. Binary Tree Right Side View		199. Binary Tree Right Side View
2. Add Two Numbers		2. Add Two Numbers
2		2
20. Valid Parentheses		20. Valid Parentheses
200. Number of Islands		200. Number of Islands
205. Isomorphic Strings		205. Isomorphic Strings
206. Reverse Linked List		206. Reverse Linked List
207. Course Schedule		207. Course Schedule
208. Implement Trie (Prefix Tree)		208. Implement Trie (Prefix Tree)
209. Minimum Size Subarray Sum		209. Minimum Size Subarray Sum
21. Merge Two Sorted Lists		21. Merge Two Sorted Lists
210. Course Schedule II		210. Course Schedule II
211. Design Add and Search Words Data Structure		211. Design Add and Search Words Data Structure
212. Word Search II		212. Word Search II
213. House Robber II		213. House Robber II
215. Kth Largest Element in an Array		215. Kth Largest Element in an Array
217. Contains_Duplicate		217. Contains_Duplicate
22. Generate Parentheses		22. Generate Parentheses
226. Invert Binary Tree		226. Invert Binary Tree
23. Merge k Sorted Lists		23. Merge k Sorted Lists
230. Kth Smallest Element in a BST		230. Kth Smallest Element in a BST
235. Lowest Common Ancestor of a Binary Search Tree		235. Lowest Common Ancestor of a Binary Search Tree
238. Product of Array Except Self		238. Product of Array Except Self
239. Sliding Window Maximum		239. Sliding Window Maximum
242. Valid Anagram		242. Valid Anagram
25. Reverse Nodes in k-Group		25. Reverse Nodes in k-Group
26. Remove Duplicates from Sorted Array		26. Remove Duplicates from Sorted Array
27. Remove Element		27. Remove Element
283. Move Zeroes		283. Move Zeroes
287. Find the Duplicate Number		287. Find the Duplicate Number
295. Find Median from Data Stream		295. Find Median from Data Stream
297. Serialize and Deserialize Binary Tree		297. Serialize and Deserialize Binary Tree
3. Longest Substring Without Repeating Characters		3. Longest Substring Without Repeating Characters
322. Coin Change		322. Coin Change
33. Search in Rotated Sorted Array		33. Search in Rotated Sorted Array
332. Reconstruct Itinerary		332. Reconstruct Itinerary
347. Top K Frequent Elements		347. Top K Frequent Elements
355. Design Twitter		355. Design Twitter
36. Valid Sudoku		36. Valid Sudoku
3651. Number of Connected Components in an Undirected Graph		3651. Number of Connected Components in an Undirected Graph
39. Combination Sum		39. Combination Sum
392. Is Subsequence		392. Is Subsequence
4. Median of Two Sorted Arrays		4. Median of Two Sorted Arrays
40. Combination Sum II		40. Combination Sum II
41. First Missing Positive		41. First Missing Positive
417. Pacific Atlantic Water Flow		417. Pacific Atlantic Water Flow
42. Trapping Rain Water		42. Trapping Rain Water
424. Longest Repeating Character Replacement		424. Longest Repeating Character Replacement

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