# Hard

- [Add Without Plus](/interview-practice-problems/coding_practice_questions/hard/add-without-plus.md)
- [Shuffle](/interview-practice-problems/coding_practice_questions/hard/shuffle.md)
- [Random Set](/interview-practice-problems/coding_practice_questions/hard/random-set.md)
- [Count of 25](/interview-practice-problems/coding_practice_questions/hard/count-of-25.md)
- [Baby Names](/interview-practice-problems/coding_practice_questions/hard/baby-names.md)
- [Majority Element](/interview-practice-problems/coding_practice_questions/hard/majority-element.md)
- [Word Distance](/interview-practice-problems/coding_practice_questions/hard/word-distance.md)
- [The Masseuse](/interview-practice-problems/coding_practice_questions/hard/the-masseuse.md)
- [Word Transformer](/interview-practice-problems/coding_practice_questions/hard/word-transformer.md)
- [Sparse Similarity](/interview-practice-problems/coding_practice_questions/hard/sparse-similarity.md)