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Archive / LeetCode
Problem solutions — approach, intuition, and complexity. Kept out of the way of the writing, but kept.
- Solutions
- 90
- Easy
- 79
- Medium
- 11
- Latest
- 2026-06-29
- Easy 2932. Maximum Strong Pair XOR I
- Easy 3090. Maximum Length Substring With Two Occurrences
- Easy 1984. Minimum Difference Between Highest and Lowest of K Scores
- Easy 2269. Find the K-Beauty of a Number
- Easy 2379. Minimum Recolors to Get K Consecutive Black Blocks
- Easy 2760. Longest Even Odd Subarray With Threshold
- Easy 1652. Defuse the Bomb
- Easy 1763. Longest Nice Substring
- Easy 1876. Substrings of Size Three with Distinct Characters
- Easy 594. Longest Harmonious Subsequence
- Easy 643. Maximum Average Subarray I
- Medium 3689. Maximum Total Subarray Value I
- Medium 22. Generate Parentheses
- Medium 5. Longest Palindromic Substring
- Easy 1518. Water Bottles
- Medium 3100. Water Bottles II
- Medium 1039. Minimum Score Triangulation of Polygon
- Medium 2221. Find Triangular Sum of an Array
- Medium 7. Reverse Integer
- Medium 8. String to Integer (atoi)
- Medium 11. Container With Most Water
- Medium 12. Integer to Roman
- Medium 6. Zigzag Conversion
- Easy 412. Fizz Buzz
- Easy 387. First Unique Character in a String
- Easy 389. Find the Difference
- Easy 392. Is Subsequence
- Easy 404. Sum of Left Leaves
- Easy 374. Guess Number Higher or Lower
- Easy 383. Ransom Note
- Easy 342. Power of Four
- Easy 344. Reverse String
- Easy 345. Reverse Vowels of a String
- Easy 349. Intersection of Two Arrays
- Easy 367. Valid Perfect Square
- Easy 292. Nim Game
- Easy 303. Range Sum Query - Immutable
- Easy 326. Power of Three
- Easy 338. Counting Bits
- Easy 278. First Bad Version
- Easy 283. Move Zeroes
- Easy 290. Word Pattern
- Easy 257. Binary Tree Paths
- Easy 258. Add Digits
- Easy 263. Ugly Number
- Easy 268. Missing Number
- Easy 231. Power of Two
- Easy 234. Palindrome Linked List
- Easy 222. Count Complete Tree Nodes
- Easy 225. Implement Stack using Queues
- Easy 226. Invert Binary Tree
- Easy 219. Contains Duplicate II
- Easy 205. Isomorphic Strings
- Easy 206. Reverse Linked List
- Easy 217. Contains Duplicate
- Easy 202. Happy Number
- Easy 203. Remove Linked List Elements
- Easy 169. Majority Element
- Easy 171. Excel Sheet Column Number
- Easy 190. Reverse Bits
- Easy 191. Number of 1 Bits
- Easy 168. Excel Sheet Column Title
- Easy 125. Valid Palindrome
- Easy 136. Single Number
- Easy 144. Binary Tree Preorder Traversal
- Easy 145. Binary Tree Postorder Traversal
- Easy 160. Intersection of Two Linked Lists
- Easy 121. Best Time to Buy and Sell Stock
- Easy 118. Pascal's Triangle
- Easy 119. Pascal's Triangle II
- Easy 69. Sqrt(x)
- Easy 70. Climbing Stairs
- Easy 83. Remove Duplicates from Sorted List
- Easy 88. Merge Sorted Array
- Easy 94. Binary Tree Inorder Traversal
- Easy 100. Same Tree
- Easy 67. Add Binary
- Easy 28. Find the Index of the First Occurrence in a String
- Easy 35. Search Insert Position
- Easy 58. Length of Last Word
- Easy 66. Plus One
- Easy 26. Remove Duplicates from Sorted Array
- Easy 27. Remove Element
- Easy 111. Minimum Depth of Binary Tree
- Easy 112. Path Sum
- Easy 141. Linked List Cycle
- Easy 110. Balanced Binary Tree
- Easy 108. Convert Sorted Array to Binary Search Tree
- Easy 101. Symmetric Tree
- Easy 104. Maximum Depth of Binary Tree