Strengths:

• The binary search implementation in Problem1.java is efficient and correctly identifies the missing number.
• The MinHeap implementation in Problem2.java is comprehensive and includes all necessary operations with proper time complexities.
• The code is well-commented and easy to follow, demonstrating good coding practices.

Areas for Improvement:

• In Problem1.java, the variable name n in the findMissing method could be more descriptive, such as expectedSize or totalNumbers, to clarify that it represents the expected size of the complete sequence.
• In Problem2.java, the heapify method could include a brief comment explaining its purpose, even though the logic is clear.
• Consider adding more test cases in the main methods to cover edge cases, such as an empty array in Problem1.java or a heap with a single element in Problem2.java.