Count three-digit numbers with distinct digits
Company: Meta
Role: Software Engineer
Category: Coding & Algorithms
Difficulty: hard
Interview Round: Onsite
Quick Answer: This question evaluates a candidate's understanding of digit manipulation, basic combinatorics, and implementation of value-range constraints in coding problems. As a Coding & Algorithms problem it is commonly asked because it reveals attention to edge cases and correctness when counting under bounds, testing practical implementation skills rather than purely theoretical reasoning.