Robina Li

Welcome to My Technical Blog

Exploring algorithms, data structures, and software engineering insights through detailed LeetCode problem solutions

169+ Problems Solved

3 Difficulty Levels

20+ Categories

Latest Posts

Feb 3, 2026

743. Network Delay Time

leetcodemediumgraphshortest-pathdijkstra

Feb 2, 2026

974. Subarray Sums Divisible by K

leetcodemediumarrayhash-tableprefix-sum

Feb 2, 2026

843. Guess the Word

leetcodehardarraystringinteractiveminmax

Feb 1, 2026

560. Subarray Sum Equals K

leetcodemediumarrayhash-tableprefix-sum

Feb 1, 2026

325. Maximum Size Subarray Sum Equals k

leetcodemediumarrayhash-tableprefix-sum

Feb 1, 2026

44. Wildcard Matching

leetcodehardstringdynamic-programminggreedytwo-pointers

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Jan 19, 2026

645. Set Mismatch

leetcodeeasyarrayhash-tablemath

Jan 19, 2026

409. Longest Palindrome

leetcodeeasystringhash-tablegreedy

Jan 19, 2026

387. First Unique Character in a String

leetcodeeasystringhash-table

Jan 19, 2026

349. Intersection of Two Arrays

leetcodeeasyarrayhash-table

Jan 19, 2026

226. Invert Binary Tree

leetcodeeasytreedfs

Jan 19, 2026

2185. Counting Words With a Given Prefix

leetcodeeasystringarray

Jan 19, 2026

1624. Largest Substring Between Two Equal Characters

leetcodeeasystringhash-table

Jan 19, 2026

112. Path Sum

leetcodeeasytreedfs

Jan 19, 2026

111. Minimum Depth of Binary Tree

leetcodeeasytreedfs

Jan 19, 2026

104. Maximum Depth of Binary Tree

leetcodeeasytreedfs