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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Dec 31, 2025

[Easy] 270. Closest Binary Search Tree Value

leetcodeeasybinary-search-treetreerecursionbinary-search

Dec 31, 2025

[Hard] 685. Redundant Connection II

leetcodehardunion-finddsugraphcycle-detectiondirected-graph

Dec 31, 2025

[Medium] 285. Inorder Successor in BST

leetcodemediumbinary-search-treetreeinorder-traversal

Dec 31, 2025

[Medium] 487. Max Consecutive Ones II

leetcodemediumarraydynamic-programmingsliding-window

Dec 31, 2025

[Easy] 661. Image Smoother

leetcodeeasymatrixarraysimulation

Dec 31, 2025

[Medium] 616. Add Bold Tag in String

leetcodemediumstringarraygreedy

Dec 30, 2025

[Medium] 681. Next Closest Time

leetcodemediumstringsimulationbrute-force

Dec 30, 2025

[Medium] 683. K Empty Slots

leetcodemediumsliding-windowtwo-pointersarray

Dec 30, 2025

[Medium] 686. Repeated String Match

leetcodemediumstring-matchingkmprabin-karprolling-hash

Dec 29, 2025

[Medium] 684. Redundant Connection

leetcodemediumunion-finddsugraphcycle-detectiondfs

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