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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Jan 15, 2026

[Hard] 315. Count of Smaller Numbers After Self

leetcodehardarraybinary-searchdivide-and-conquerbinary-indexed-treesegment-treemerge-sort

Jan 14, 2026

[Medium] LCR 113. Course Schedule II

leetcodemediumgraphtopological-sortdfs

Jan 14, 2026

[Medium] 310. Minimum Height Trees

leetcodemediumgraphtreetopological-sortbfs

Jan 14, 2026

[Hard] 269. Alien Dictionary

leetcodehardgraphtopological-sortstring

Jan 13, 2026

[Medium] 1670. Design Front Middle Back Queue

leetcodemediumdesigndequedata-structure

Jan 12, 2026

[Medium] 79. Word Search

leetcodemediumarraybacktrackingmatrixdfs

Jan 12, 2026

[Medium] 22. Generate Parentheses

leetcodemediumstringbacktrackingrecursion

Jan 12, 2026

[Hard] 51. N-Queens

leetcodehardarraybacktrackingrecursion

Jan 12, 2026

[Easy] 844. Backspace String Compare

leetcodeeasystringtwo-pointersstack

Jan 11, 2026

[Medium] 721. Accounts Merge

leetcodemediumarrayhash-tablestringunion-finddfs

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