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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Feb 10, 2026

3341. Find Minimum Time to Reach Last Room I

Problem Statement

leetcodemediumgraphshortest-pathdijkstragrid

Feb 9, 2026

91. Decode Ways

leetcodemediumdynamic-programming

Feb 9, 2026

1944. Number of Visible People in a Queue

leetcodehardstackmonotonic-stack

Feb 8, 2026

3112. Minimum Time to Visit Disappearing Nodes

leetcodemediumgraphshortest-pathdijkstra

Feb 8, 2026

210. Course Schedule II

leetcodemediumgraphtopological-sort

Feb 7, 2026

1488. Avoid Flood in The City

leetcodemediumarraygreedybinary-searchset

Feb 6, 2026

875. Koko Eating Bananas

leetcodemediumarraybinary-search

Feb 6, 2026

532. K-diff Pairs in an Array

leetcodemediumarrayhash-table

Feb 6, 2026

3439. Reschedule Meetings for Maximum Free Time I

leetcodemediumarrayintervalssliding-windowprefix-sum

Feb 6, 2026

252. Meeting Rooms

leetcodeeasyarraysortingintervals