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239 Commits
.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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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

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