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

Apr 18, 2026

[Medium] 221. Maximal Square

Given an m x n binary matrix filled with '0's and '1's, find the largest square containing only '1's and...
leetcodemediumdynamic-programming
Apr 17, 2026

[Medium] 274. H-Index

Given an array of integers citations where citations[i] is the number of citations a researcher received for their i-th paper,...
leetcodemediumsorting
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Nov 15, 2025

[Medium] 146. LRU Cache

[Medium] 146. LRU Cache
leetcodealgorithmmediumcppdesigndata-structureshash-maplinked-listproblem-solving
Nov 14, 2025

[Hard] 460. LFU Cache

[Hard] 460. LFU Cache
leetcodealgorithmhardcppdesigndata-structureshash-maplinked-listproblem-solving
Nov 14, 2025

Algorithm Templates: Stack

Minimal, copy-paste C++ for parentheses matching, expression evaluation, nested structures, and monotonic stack.
leetcodetemplatesstackdata-structures
Nov 14, 2025

Algorithm Templates: Calculator

Minimal, copy-paste C++ for expression evaluation with +, −, ×, ÷ and parentheses. See also Stack for RPN and nested expressions.
leetcodetemplatescalculatorexpression-evaluation
Nov 5, 2025

[Medium] 324. Wiggle Sort II

[Medium] 324. Wiggle Sort II
leetcodealgorithmmediumcpparraysnth-elementthree-way-partitionindex-mappingproblem-solving

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