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 25, 2025

[Medium] LC 863: All Nodes Distance K in Binary Tree

leetcodemediumtreedfsbfs

Oct 22, 2025

[Medium] LC 1249: Minimum Remove to Make Valid Parentheses

leetcodemediumstringstack

Oct 22, 2025

[Medium] LC 1094: Car Pooling

leetcodemediumarraysorting

Oct 22, 2025

[Medium] LC 426: Convert Binary Search Tree to Sorted Doubly Linked List

leetcodemediumtreelinked-list

Oct 22, 2025

[Medium] LC 348: Design Tic-Tac-Toe

leetcodemediumdesignarray

Oct 22, 2025

[Medium] LC 419: Battleships in a Board

leetcodemediumarraymatrix

Oct 21, 2025

[Medium] LC 545: Boundary of Binary Tree

leetcodemediumtreedfs

Oct 21, 2025

[Medium] LC 347: Top K Frequent Elements

leetcodemediumarrayhash-tableheap

Oct 21, 2025

[Medium] LC 973: K Closest Points to Origin

leetcodemediumarraysorting

Oct 21, 2025

[Easy] LC 1207: Unique Number of Occurrences

leetcodeeasyarrayhash-table

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