Worked on the doocs/leetcode repository, focusing on improving the reliability of C++ solutions for algorithmic problems. Addressed a bug in the Lemonade Change Problem (LC860) by correcting the initial tracking of ten-dollar bills, ensuring accurate handling of cash transactions and reducing the risk of edge-case failures. Applied strong debugging discipline and leveraged git for precise change management, preparing the fix for regression testing and code review. Demonstrated expertise in C++ programming, algorithm development, and problem solving, with an emphasis on solution correctness and maintainability. No new features were introduced during this period, concentrating efforts on robust bug resolution.