| Title | Difficulty | Solution | Attempted |
|---|---|---|---|
| Find All Numbers Disappeared in an Array | Easy | 📖 | ✅ |
| Jewels and Stones | Easy | 📖 | ✅ |
| Reverse Integer | Easy | 📖 | ✅ |
| To Lower Case | Easy | 📖 | ✅ |
| Two Sum | Easy | 📖 | ✅ |
| Letter Combinations of a Phone Number | Medium | 📖 | ✅ |
| Number of Islands | Medium | 📖 | ✅ |