Day 4 of #tcsnqtwithgfg 🚀 | Smarter Thinking > Harder Thinking | [26-02-2026] Today’s sessions by GeeksforGeeks weren’t just about solving questions — they were about solving them efficiently. 💻 ...

This page contains solutions for all HackerRank Java challenges which were passed successfully. There can be multiple ways of approaching solution to any problem. Please find the provided solutions ...

Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below.