During April 2025, Dale contributed to the DaleStudy/leetcode-study repository by implementing a HashMap-based solution for the classic Two Sum problem. Using Java, Dale focused on algorithm optimization and data structure selection, leveraging Hash Tables to achieve O(n) time complexity for sum-to-target queries. The work addressed a common interview scenario, providing a reusable and efficient algorithm for the repository’s users. Dale ensured clean code traceability through well-documented, focused commits, aligning with the project’s LeetCode study objectives. While no bugs were reported or fixed during this period, the contribution demonstrated depth in algorithmic thinking and practical application of core Java skills.