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 22, 2026

134. Gas Station

leetcodemediumgreedyarray

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

View All Posts

All Posts

Nov 5, 2025

[Hard] 480. Sliding Window Median

leetcodealgorithmhardcpparraysmultisetsliding-windowtwo-heapsproblem-solving

Nov 5, 2025

[Hard] 239. Sliding Window Maximum

leetcodealgorithmhardcpparraysdequesliding-windowmonotonic-queueproblem-solving

Nov 5, 2025

[Easy] 485. Max Consecutive Ones

leetcodealgorithmeasycpparrayssliding-windowproblem-solving

Nov 5, 2025

[Medium] 18. 4Sum

leetcodealgorithmmediumcpparraystwo-pointerssortingproblem-solving

Oct 29, 2025

LeetCode Templates: Trees

Contents

leetcodetemplatestrees

Oct 29, 2025

LeetCode Templates: Math & Geometry

Contents

leetcodetemplatesmathgeometry

Oct 29, 2025

LeetCode Templates: Graph

Contents

leetcodetemplatesgraph

Oct 29, 2025

LeetCode Templates: Dynamic Programming

Contents

leetcodetemplatesdynamic-programming

Oct 29, 2025

LeetCode Templates: Data Structures

Contents

leetcodetemplatesdata-structures

Oct 29, 2025

LeetCode Templates: Arrays & Strings

Contents

leetcodetemplatesarraysstrings