During April 2025, Cham0810 contributed foundational problem-solving features to the DaleStudy/leetcode-study repository, focusing on core algorithmic challenges. Cham0810 implemented efficient Python solutions for duplicate detection in lists and the classic Two Sum problem, leveraging hash tables and dictionary-based patterns to ensure optimal O(n) performance. The work emphasized code readability and maintainability, with explicit time-complexity annotations and formatting improvements to support future contributors. By maintaining clear commit messages and repository hygiene, Cham0810 reduced onboarding friction and minimized regression risk. The contributions demonstrated practical skills in algorithm analysis, data structures, and file formatting, establishing a robust base for ongoing development.