Leetcode Solutions

Notion Database - all of my notes on the problems

I prefer to initially code using Google Docs as my primary platform, unless it's a new topic that necessitates debugging in a terminal or if I encounter challenges that prevent me from completing the task within the allotted time. (30m)

---

Problems:

• 1. Two Sum
• 2. Add Two Numbers
• 3. Longest Substring Without Repeating Characters
• 4. Median of Two Sorted Arrays
• 5. Longest Palindromic Substring
• 7. Generate Parentheses
• 9. Palindrome Number
• 11. Container With Most Water
• 15. 3Sum
• 19. Remove Nth Node From End of List
• 20. Valid Parentheses
• 21. Merge Two Sorted Lists
• 22. Generate Parentheses
• 23. Merge k Sorted Lists
• 33. Search in Rotated Sorted Array
• 48. Rotate Image
• 49. Group Anagrams
• 53. Maximum Subarray
• 54. Spiral Matrix
• 56. Merge Intervals
• 57. Insert Interval
• 73. Set Matrix Zeroes
• 76. Minimum Window Substring
• 79. Word Search
• 83. Remove Duplicates from Sorted List
• 98. Validate Binary Search Tree
• 100. Same Tree
• 102. Binary Tree Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 121. Best Time to Buy and Sell Stock
• 128. Longest Consecutive Sequence
• 133. Clone Graph
• 135. Candy
• 124. Binary Tree Maximum Path Sum
• 125. Valid Palindrome
• 141. Linked List Cycle
• 143. Reorder List
• 151. Reverse Words in a String
• 152. Maximum Product Subarray
• 153. Find Minimum in Rotated Sorted Array
• 190. Reverse Bits
• 191. Number of 1 Bits
• 198. House Robber
• 200. Number of Islands
• 206. Reverse Linked List
• 207. Course Schedule
• 208. Implement Trie (Prefix Tree)
• 211. Design Add and Search Words Data Structure
• 212. Word Search II
• 213. House Robber II
• 217. Contains Duplicate
• 226. Invert Binary Tree
• 230. Kth Smallest Element in a BST
• 235. Lowest Common Ancestor of a Binary Search Tree
• 238. Product of Array Except Self
• 242. Valid Anagram
• 268. Missing Number
• 271. Encode and Decode Strings (Premium)
• 283. Move Zeroes
• 295. Find Median from Data Stream
• 297. Serialize and Deserialize Binary Tree
• 345. Reverse Vowels of a String
• 371. Sum of Two Integers
• 374. Top K Frequent Elements
• 334. Increasing Triplet Subsequence
• 338. Counting Bits
• 383. Ransom Note
• 392. Is Subsequence
• 394. Decode String
• 412. Fizz Buzz
• 417. Pacific Atlantic Water Flow
• 424. Longest Repeating Character Replacement
• 435. Non-overlapping Intervals
• 443. String Compression
• 530. Minimum Absolute Difference in BST
• 572. Subtree of Another Tree
• 605. Can Place Flowers
• 643. Maximum Average Subarray I
• 647. Palindromic Substrings
• 714. Best Time to Buy and Sell Stock with Transaction Fee
• 724. Find Pivot Index
• 735. Asteroid Collision
• 743. Network Delay Time
• 771. Jewels and Stones
• 832. Flipping an Image
• 876. Middle of the Linked List
• 997. Find the Town Judge
• 1004. Max Consecutive Ones III
• 1027. Longest Arithmetic Subsequence
• 1071. Greatest Common Divisor of Strings
• 1161. Maximum Level Sum of a Binary Tree
• 1187. Make Array Strictly Increasing
• 1207. Unique Number of Occurrences
• 1342. Number of Steps to Reduce a Number to Zero
• 1365. How Many Numbers Are Smaller Than the Current Number
• 1431. Kids With the Greatest Number of Candies
• 1456. Maximum Number of Vowels in a Substring of Given Length
• 1480. Running Sum of 1d Array
• 1493. Longest Subarray of 1's After Deleting One Element
• 1512. Number of Good Pairs
• 1569. Number of Ways to Reorder Array to Get Same BST
• 1572. Matrix Diagonal Sum
• 1657. Determine if Two Strings Are Close
• 1672. Richest Customer Wealth
• 1679. Max Number of K-Sum Pairs
• 1732. Find the Highest Altitude
• 1768. Merge Strings Alternately
• 1791. Find Center of Star Graph
• 1909. Remove One Element to Make the Array Strictly Increasing
• 1971. Find if Path Exists in Graph
• 2090. K Radius Subarray Averages
• 2215. Find the Difference of Two Arrays
• 2352. Equal Row and Column Pairs
• 2373. Largest Local Values in a Matrix
• 2390. Removing Stars From a String
• 2448. Minimum Cost to Make Array Equal

---

Table of Contents

---

solution.js - The solution I submitted

my_solution.js - My attemp with logs and comments

o_solution.js - Online/others' solutions

---

Commands for myself

Elixir

To run the Elixir solution:

iex ./.../solution.ex

Batch create:

chapter=1572 && mkdir ./$chapter && touch ./$chapter/my_solution.ex && touch ./$chapter/solution.ex && alias x="iex ./$chapter/my_solution.ex"

then you can use x for quick debug.

---

JavaScript

To run the JS solution:

node ./.../solution.js

Batch create:

chapter=743 && mkdir ./$chapter && touch ./$chapter/my_solution.js && touch ./$chapter/solution.js && alias x="node ./$chapter/my_solution.js"

then you can use x for quick debug.

---

Author: Jing Hui PANG - LinkedIn | Email | GitHub | LeetCode | WakaTime