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

[Medium] 1962. Remove Stones to Minimize the Total

leetcodemediumarraygreedyheap

Apr 21, 2026

[Medium] 2952. Minimum Number of Coins to be Added

leetcodemediumarraygreedysorting

Apr 21, 2026

[Medium] 2592. Maximize Greatness of an Array

leetcodemediumarraygreedysorting

Apr 20, 2026

[Medium] 2571. Minimum Operations to Reduce an Integer to 0

leetcodemediummathgreedybit-manipulation

Apr 19, 2026

[Medium] 2539. Count the Number of Good Subsequences

leetcodemediumstringcombinatoricsmathhash-map

Apr 18, 2026

[Medium] 329. Longest Increasing Path in a Matrix

leetcodemediummatrixdynamic-programmingdfs

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Oct 20, 2025

[Medium] 207. Course Schedule

leetcodemediumgraphtopological-sortcycle-detection

Oct 20, 2025

[Medium] 133. Clone Graph

leetcodemediumgraphdfsbfsclone

Oct 20, 2025

[Medium] 752. Open the Lock

leetcodemediumbfsshortest-pathlock

Oct 20, 2025

[Medium] 314. Binary Tree Vertical Order Traversal

leetcodemediumtreebfsvertical-order

Oct 20, 2025

[Medium] 322. Coin Change

leetcodemediumdynamic-programmingdpcoin-change

Oct 20, 2025

[Medium] 47. Permutations II

leetcodealgorithmmediumbacktrackingrecursionduplicates

Oct 20, 2025

[Medium] 77. Combinations

leetcodemediumbacktrackingrecursioncombinations

Oct 20, 2025

[Medium] 46. Permutations

leetcodealgorithmmediumbacktrackingrecursion

Oct 20, 2025

[Medium] 1650. Lowest Common Ancestor of a Binary Tree III

leetcodealgorithmmediumtreebinary-treelca

Oct 20, 2025

[Medium] 2043. Simple Bank System

leetcodealgorithmmediumdesigndata-structure

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