LeetCode “Letter Combinations of a Phone Number” – Backtracking Made Simple (Medium Problem)

In this video, we solve the classic LeetCode medium problem: Letter Combinations of a Phone Number. Given digits from 2–9, the task is to generate every possible letter combination using the classic phone keypad mapping. You’ll learn: How to use backtracking to explore all valid combinations How the digit-to-letters mapping works How to write a clean, efficient, interview-ready solution This is a fundamental recursion + backtracking pattern you’ll see in many technical interviews. Perfect practice for building confidence in solving combinatorial problems. If this helped you, make sure to like, comment, and subscribe for more clean LeetCode walkthroughs!