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 29, 2025

LeetCode Templates: Advanced Techniques

Contents

leetcodetemplatesadvanced

Oct 29, 2025

LeetCode Categories and Solution Templates

leetcodealgorithmproblem-solvingtemplates

Oct 29, 2025

LC 717: 1-bit and 2-bit Characters

leetcodeeasyarrayparsing

Oct 29, 2025

LC 344: Reverse String

leetcodeeasytwo-pointersstring

Oct 28, 2025

LC 708: Insert into a Sorted Circular Linked List

leetcodemediumlinked-listcircular

Oct 28, 2025

LC 636: Exclusive Time of Functions

leetcodemediumstackparsing

Oct 25, 2025

LC 863: All Nodes Distance K in Binary Tree

leetcodemediumtreedfsbfs

Oct 22, 2025

LC 1249: Minimum Remove to Make Valid Parentheses

leetcodemediumstringstack

Oct 22, 2025

LC 1094: Car Pooling

leetcodemediumarraysorting

Oct 22, 2025

LC 426: Convert Binary Search Tree to Sorted Doubly Linked List

leetcodemediumtreelinked-list