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 12, 2026

79. Word Search

leetcodemediumarraybacktrackingmatrixdfs

Jan 12, 2026

22. Generate Parentheses

leetcodemediumstringbacktrackingrecursion

Jan 12, 2026

51. N-Queens

leetcodehardarraybacktrackingrecursion

Jan 12, 2026

844. Backspace String Compare

leetcodeeasystringtwo-pointersstack

Jan 11, 2026

721. Accounts Merge

leetcodemediumarrayhash-tablestringunion-finddfs

Jan 10, 2026

64. Minimum Path Sum

leetcodemediumarraydynamic-programmingmatrix

Jan 10, 2026

1340. Jump Game V

leetcodehardarraydynamic-programmingdfsmemoization

Jan 9, 2026

673. Number of Longest Increasing Subsequence

leetcodemediumarraydynamic-programming

Jan 8, 2026

692. Top K Frequent Words

leetcodemediumhash-tableheapsortingstring

Jan 8, 2026

5. Longest Palindromic Substring

leetcodemediumstringtwo-pointersdynamic-programming