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

Feb 5, 2026

1109. Corporate Flight Bookings

leetcodemediumarrayprefix-sumdifference-array

Feb 4, 2026

787. Cheapest Flights Within K Stops

leetcodemediumgraphshortest-pathdynamic-programmingbellman-ford

Feb 3, 2026

743. Network Delay Time

leetcodemediumgraphshortest-pathdijkstra

Feb 2, 2026

974. Subarray Sums Divisible by K

leetcodemediumarrayhash-tableprefix-sum

Feb 2, 2026

843. Guess the Word

leetcodehardarraystringinteractiveminmax

Feb 1, 2026

560. Subarray Sum Equals K

leetcodemediumarrayhash-tableprefix-sum

Feb 1, 2026

325. Maximum Size Subarray Sum Equals k

leetcodemediumarrayhash-tableprefix-sum

Feb 1, 2026

44. Wildcard Matching

leetcodehardstringdynamic-programminggreedytwo-pointers

Jan 30, 2026

981. Time Based Key-Value Store

leetcodemediumhash-tablebinary-searchdesign

Jan 30, 2026

34. Find First and Last Position of Element in Sorted Array

leetcodemediumarraybinary-search