💡 Day 3 of the 31 Days of Code Challenge 💡
Taking full advantage of today’s holiday, I not only continued with my #DrGViswanathan Challenge but also participated in a GeeksforGeeks contest—and I’m happy to say, I did pretty well! 🎉 It’s been a productive day filled with coding and problem-solving!
Today’s challenge was an interesting problem involving keypad combinations. Given a keypad and an N-digit number, the task was to list all possible words formed by pressing the corresponding keys, just like we used to text back in the day. 📱
Problem Summary:
Given an array representing numbers pressed on a keypad, the goal was to generate all possible letter combinations. For example, pressing 2, 3, and 4 could generate combinations like adg, adh, afg, etc. It was all about recursive backtracking to explore every possible combination.
Approach:
Mapping keypad to letters:
I first set up an array mapping each number to the corresponding letters on a traditional phone keypad.
Recursive backtracking:
Starting with the first digit, I recursively generated every possible letter combination for the given sequence of numbers.
For each digit, I appended a letter to a combination, moved to the next digit, and repeated the process.
Storing results:
Once all digits were processed, the generated word was stored in the result list. The recursion ensured all combinations were explored efficiently.
Takeaway:
The problem was a great exercise in recursive backtracking, and it felt rewarding to generate a long list of word combinations! It’s exciting to push through these challenges while juggling a coding contest as well. Day 3 complete! 🚀
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