Disappeared Numbers:

• Strengths: The solution is optimal in both time and space complexity. The use of the input array as a hash map is a clever optimization.
• Areas for Improvement: The comments could be more detailed to explain the logic behind the negative marking, especially for someone who might not be familiar with this technique.

Game of Life:

• Strengths: The solution correctly implements the Game of Life rules with an efficient in-place approach. The use of temporary markers is a good strategy to preserve the original state.
• Areas for Improvement: The comments could be expanded to explain why temporary markers are used and how they help in preserving the original state. Additionally, the function getNeighborCount could be documented to clarify its purpose and parameters.

General:

• Strengths: Both solutions are well-structured and follow best practices. The code is readable and efficient.
• Areas for Improvement: Adding more detailed comments and documentation would enhance the readability and maintainability of the code, especially for complex logic like the temporary markers in the Game of Life problem.