Completed Pandas1

[sangeeths29]

No description provided.

[super30admin]

The student's solutions demonstrate a good understanding of pandas operations for solving these LeetCode problems. Here's a detailed evaluation:

1. Correctness:

• Problem 2 (Big Countries): Correctly filters countries based on area or population criteria.
• Problem 3 (Recyclable Products): Properly identifies products meeting both conditions.
• Problem 4 (Customers Never Order): Correctly uses ~isin() to find customers without orders.

2. Time Complexity:

• All solutions use pandas vectorized operations which are efficient (O(n) for filtering operations).
• The ~isin() operation in Problem 4 is particularly well-chosen for this task.

3. Space Complexity:

• All solutions create new DataFrames (df) which requires O(n) space, but this is standard for pandas operations.

4. Code Quality:

• Good:
  • Consistent style and formatting
  • Clear variable naming
  • Appropriate use of pandas operations
• Areas for improvement:
  • Could add docstrings explaining the functions
  • In Problem 4, the rename operation could be more readable if done separately

5. Efficiency:

• All solutions are already quite efficient using pandas' built-in operations.
• No major optimizations needed, though for very large datasets, memory usage could be considered.

Edge Cases:

• Problem 2: Handles cases where either condition is met.
• Problem 3: Correctly uses & for both conditions.
• Problem 4: Properly handles empty orders DataFrame.