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

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All Posts

Oct 3, 2025

[Medium] 96. Unique Binary Search Trees

pythonbinary-search-treesproblem-solving

Sep 30, 2025

[Medium] 131. Palindrome Partitioning

pythonpartitioningproblem-solving

Sep 29, 2025

[Medium] 77. Combinations

pythoncombinationsdfsproblem-solving

Sep 25, 2025

[Medium] 89. Gray Code

pythongray-codeproblem-solving

Sep 25, 2025

[Medium] 54. Spiral Matrix

pythonspiral-matrixproblem-solving

Sep 25, 2025

[Medium] 50. Pow(x, n)

pythonpowproblem-solving

Sep 24, 2025

[Medium] 62. Unique Paths

pythonunique-pathsproblem-solving

Sep 24, 2025

[Hard] 25. Reverse Nodes in k-Group

pythonreverse-nodesk-grouprecursionproblem-solving

Sep 24, 2025

[Medium] 48. Rotate Image

pythonrotate-imagein-placeproblem-solving

Sep 24, 2025

[Medium] 150. Evaluate Reverse Polish Notation

pythonreverse-polish-notationrpnproblem-solving