During March 2026, Dayslab developed a Core Algorithm Challenge Solutions Library for the DaleStudy/leetcode-study repository, focusing on reusable solutions to common algorithmic problems. Using Kotlin and leveraging skills in algorithm design and data structures, Dayslab implemented five solutions, including duplicates, house robber, longest consecutive sequence, top K frequent elements, and two-sum. The work emphasized performance by optimizing frequency map initial capacity and improved code readability through refactoring priority queue operations. Dayslab maintained a clear, traceable commit history to support ongoing development. The project provided a foundation for rapid learning cycles and efficient reuse of proven algorithmic approaches in Kotlin.