During July 2025, Shinhee Kim contributed to the DaleStudy/leetcode-study repository by developing Java solutions for two foundational array problems, focusing on algorithm implementation and data structures. Shinhee implemented a contains-duplicate check using a HashSet to efficiently identify repeated elements and created a brute-force approach for the Two Sum problem, demonstrating practical use of core algorithmic concepts. Additionally, Shinhee addressed repository maintenance by restoring tracking for the leetcode-study.iml file, ensuring consistent IDE configuration for collaborators. The work reflected a solid grasp of Java, brute-force techniques, and repository hygiene, with clear, traceable commits that supported both code maintainability and interview preparation.