Robina Li

Welcome to My Technical Blog

Exploring algorithms, data structures, and software engineering insights through LeetCode solutions in Python.
NOTE: This blog is still under construction and some python code blocks may not be rendered correctly when converted from C++ with AI.

169+ Problems Solved

3 Difficulty Levels

20+ Categories

Latest Posts

Mar 21, 2026

713. Subarray Product Less Than K

leetcodemediumarraysliding-window

Mar 20, 2026

309. Best Time to Buy and Sell Stock with Cooldown

leetcodemediumdpstock

Mar 19, 2026

362. Design Hit Counter

leetcodemediumdesignqueuesliding-window

Mar 18, 2026

1448. Count Good Nodes in Binary Tree

leetcodemediumtreedfsbfs

Mar 17, 2026

1376. Time Needed to Inform All Employees

leetcodemediumtreegraphdfsbfs

Mar 16, 2026

2406. Divide Intervals Into Minimum Number of Groups

leetcodemediumintervalheapsweep-line

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All Posts

Jan 1, 2026

418. Sentence Screen Fitting

leetcodemediumdynamic-programmingstringsimulation

Jan 1, 2026

496. Next Greater Element I

leetcodeeasyarraystackmonotonic-stackhash-table

Jan 1, 2026

360. Sort Transformed Array

leetcodemediumarraytwo-pointersmathparabola

Dec 31, 2025

715. Range Module

leetcodeharddesigndata-structuresintervalmaptree-map

Dec 31, 2025

425. Word Squares

leetcodehardbacktrackingtrierecursionstring

Dec 31, 2025

270. Closest Binary Search Tree Value

leetcodeeasybinary-search-treetreerecursionbinary-search

Dec 31, 2025

685. Redundant Connection II

leetcodehardunion-finddsugraphcycle-detectiondirected-graph

Dec 31, 2025

285. Inorder Successor in BST

leetcodemediumbinary-search-treetreeinorder-traversal

Dec 31, 2025

487. Max Consecutive Ones II

leetcodemediumarraydynamic-programmingsliding-window

Dec 31, 2025

661. Image Smoother

leetcodeeasymatrixarraysimulation