Robina Li

Welcome to My Technical Blog

Exploring algorithms, data structures, and software engineering insights through detailed LeetCode problem solutions

169+ Problems Solved

3 Difficulty Levels

20+ Categories

Latest Posts

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

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Nov 24, 2025

[Medium] 1209. Remove All Adjacent Duplicates in String II

leetcodealgorithmmediumcppstringstacktwo-pointersproblem-solving

Nov 24, 2025

[Hard] 489. Robot Room Cleaner

leetcodealgorithmhardcppdfsbacktrackingproblem-solving

Nov 24, 2025

[Hard] 32. Longest Valid Parentheses

leetcodealgorithmhardcppstringdynamic-programmingstackproblem-solving

Nov 24, 2025

[Easy] 938. Range Sum of BST

leetcodealgorithmeasycpptreebstdfsproblem-solving

Nov 24, 2025

[Easy] 408. Valid Word Abbreviation

leetcodealgorithmeasycppstringtwo-pointersproblem-solving

Nov 24, 2025

[Easy] 1047. Remove All Adjacent Duplicates In String

leetcodealgorithmeasycppstringstacktwo-pointersproblem-solving

Nov 24, 2025

LeetCode Templates: String Processing

Contents

leetcodetemplatesstring

Nov 24, 2025

LeetCode Templates: Queue

Contents

leetcodetemplatesqueue

Nov 24, 2025

LeetCode Templates: Math & Bit Manipulation

Contents

leetcodetemplatesmathbit-manipulation

Nov 24, 2025

LeetCode Templates: Linked List

Contents

leetcodetemplateslinked-list