All companies
Lucid
2 Easy3 Medium1 Hard6 total
| No. | Problem | Difficulty | Frequency |
|---|---|---|---|
| 2603 | Collect Coins in a Tree | Hard | |
| 1742 | Maximum Number of Balls in a Box | Easy | |
| 20 | Valid Parentheses | Easy | |
| 200 | Number of Islands | Medium | |
| 155 | Min Stack | Medium | |
| 236 | Lowest Common Ancestor of a Binary Tree | Medium |