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 20, 2026

[Medium] 498. Diagonal Traverse

leetcodemediumarraymatrixsimulation

Jan 20, 2026

[Medium] 189. Rotate Array

leetcodemediumarray

Jan 20, 2026

Algorithm Templates: Search

Minimal, copy-paste C++ for binary search, rotated arrays, 2D search, and answer-space search. Matches Data Structures lower/upper bound style.

leetcodetemplatessearchbinary-search

Jan 20, 2026

[Hard] 327. Count of Range Sum

leetcodehardarraydivide-and-conquer

Jan 19, 2026

[Medium] 236. Lowest Common Ancestor of a Binary Tree

leetcodemediumtreedfs

Jan 19, 2026

[Medium] 211. Design Add and Search Words Data Structure

leetcodemediumstringdesigntrie

Jan 19, 2026

[Medium] 1701. Average Waiting Time

leetcodemediumarraysimulation

Jan 19, 2026

[Easy] 645. Set Mismatch

leetcodeeasyarrayhash-tablemath

Jan 19, 2026

[Easy] 409. Longest Palindrome

leetcodeeasystringhash-tablegreedy

Jan 19, 2026

[Easy] 387. First Unique Character in a String

leetcodeeasystringhash-table

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