Worked on the doocs/leetcode repository with a focus on improving the correctness and stability of existing Python solutions. Addressed a bug in the LastVisitedIntegers function by refactoring it to use a list of integers, which enhanced the accuracy of tracking previously seen values and ensured the function returned the correct last visited integer based on input. Updated the Python solution for LeetCode No. 2899 to align with recent refactoring efforts, emphasizing robust algorithm development and careful handling of data structures. The work prioritized maintenance and reliability, reducing edge-case failures and increasing the overall dependability of the solution set.