How do you solve Find Products with Valid Serial Numbers on LeetCode?

Find Products with Valid Serial Numbers (LeetCode #3465) can be solved using Brute Force or Optimal Solution. The optimal approach is Optimal Solution with O(n) time complexity and O(n) space complexity. Key insight: Regular expressions can simplify pattern matching.

What is the time complexity of Find Products with Valid Serial Numbers?

The optimal solution for Find Products with Valid Serial Numbers runs in O(n) time and uses O(n) space. The regex engine processes each description in linear time, making it efficient.

What is the brute force solution for Find Products with Valid Serial Numbers?

The brute force approach for Find Products with Valid Serial Numbers is Brute Force, with O(n²) time complexity and O(1) space complexity. Check each product's description for the serial number pattern by scanning through the text. It's straightforward but inefficient. The optimal Optimal Solution approach improves this to O(n).

What algorithm or data structure is used to solve Find Products with Valid Serial Numbers?

Find Products with Valid Serial Numbers uses the following concepts: Database. The recommended patterns to study are: Regular Expressions, Pattern Matching.

What are the interview tips for Find Products with Valid Serial Numbers?

Understand regex basics for pattern matching. Practice SQL queries for efficiency.

What are common mistakes when solving Find Products with Valid Serial Numbers?

Overlooking case sensitivity in regex. Not considering edge cases in descriptions.

#3465

Find Products with Valid Serial Numbers

Easy

DatabaseRegular ExpressionsPattern Matching

LeetCode ↗

Approaches

Brute ForceOptimal

Complexity Comparison

	Brute Force	Optimal Solution★
Time	O(n²)	O(n)
Space	O(1)	O(n)

💡

Intuition

Time O(n)Space O(n)

Use a regular expression to efficiently find valid serial numbers in each description, leveraging SQL's pattern matching capabilities.

⚙️

Algorithm

3 steps

1Step 1: Use a SQL query with a regular expression to match the serial number pattern.
2Step 2: Filter results directly in the query to return only valid product IDs.
3Step 3: Order the results by product_id.

solution.py1 lines

1SELECT product_id FROM products WHERE description REGEXP 'SN[0-9]{4}-[0-9]{4}' ORDER BY product_id;

ℹ

Complexity note: The regex engine processes each description in linear time, making it efficient.

1Regular expressions can simplify pattern matching.
2SQL's built-in functions can optimize queries.

Solutions and explanations are original Tejav content. Problem titles © LeetCode — use the LeetCode button above for the full problem statement.