December 2024 Monthly Summary - DaleStudy/leetcode-study Overall impact: - Strengthened the core problem-solving library with three robust LeetCode-style solutions, expanding the repository's coverage for interview prep and learning. Key features delivered: - Contains Duplicate Detection in Integer Arrays: Implemented a Set-based approach to detect duplicates; scalable for large inputs. Commit 19f620541d62578274a19553a3fea918ce808374. Description: compares set size to array length to determine duplicates. - Valid Palindrome Checker: Implemented a robust palindrome check with preprocessing (lowercasing, removing non-alphanumeric) and a deque-based forward/backward symmetry check. Commit 4bf599c0c3bbd1e11773c4221051c11c5923b275. - Top K Frequent Elements: Implemented frequency counting with a HashMap and sorting to return top-k elements. Commit 09eed96678fcf7553ba3d14f00753df723aa406d. Major bugs fixed: - No major bugs reported this month; no production incidents. Minor refactors focused on clarity and testability. Technologies/skills demonstrated: - Data structures: Set, deque, HashMap - Algorithms: linear-time duplicate detection, palindrome validation, frequency counting with sorting - Code quality: clear abstractions, edge-case handling, and documentation in commit messages Accomplishments: - Three features completed within December 2024, enhancing the repository for learners and interview preparation and enabling faster onboarding.