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 19, 2026

[Easy] 409. Longest Palindrome

leetcodeeasystringhash-tablegreedy

Jan 18, 2026

[Medium] 208. Implement Trie (Prefix Tree)

leetcodemediumstringdesigntrie

Jan 18, 2026

[Hard] 732. My Calendar III

leetcodehardarraybinary-searchdesignsegment-treeordered-set

Jan 18, 2026

[Easy] 3110. Score of a String

leetcodeeasystringarray

Jan 17, 2026

[Medium] 729. My Calendar I

leetcodemediumarraybinary-searchdesignordered-set

Jan 17, 2026

[Hard] 315. Count of Smaller Numbers After Self

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

Jan 16, 2026

[Medium] 3477. Number of Unplaced Fruits

leetcodemediumarraygreedysegment-tree

Jan 16, 2026

[Medium] 307. Range Sum Query - Mutable

leetcodemediumarraysegment-treebinary-indexed-tree

Jan 16, 2026

[Hard] 305. Number of Islands II

leetcodehardarrayunion-findgraph

Jan 15, 2026

[Medium] 802. Find Eventual Safe States

leetcodemediumgraphdfscycle-detection

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