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 1, 2026

[Medium] 1177. Can Make Palindrome from Substring

leetcodemediumstringbit-manipulationprefix-sumhash-table

Jan 1, 2026

[Easy] 303. Range Sum Query - Immutable

leetcodeeasyarraydesignprefix-sum

Jan 1, 2026

[Medium] 393. UTF-8 Validation

leetcodemediumbit-manipulationstringarray

Jan 1, 2026

[Hard] 308. Range Sum Query 2D - Mutable

leetcodeharddesigndata-structuresprefix-summatrix

Jan 1, 2026

[Hard] 568. Maximum Vacation Days

leetcodeharddynamic-programminggraphoptimization

Jan 1, 2026

[Medium] 418. Sentence Screen Fitting

leetcodemediumdynamic-programmingstringsimulation

Jan 1, 2026

[Easy] 496. Next Greater Element I

leetcodeeasyarraystackmonotonic-stackhash-table

Jan 1, 2026

[Medium] 360. Sort Transformed Array

leetcodemediumarraytwo-pointersmathparabola

Dec 31, 2025

[Hard] 715. Range Module

leetcodeharddesigndata-structuresintervalmaptree-map

Dec 31, 2025

[Hard] 425. Word Squares

leetcodehardbacktrackingtrierecursionstring

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