Tripadvisor
5 problems
| Problem | Difficulty | Frequency ↓ | Topics |
|---|---|---|---|
| 20. Valid Parentheses | Easy | 100% | TopicsStringStackBracket Sequences |
| 1002. Find Common Characters | Easy | 89% | TopicsArrayHash TableString |
| 383. Ransom Note | Easy | 69.7% | TopicsHash TableStringCounting |
| 146. LRU Cache | Medium | 61.7% | TopicsHash TableLinked ListDesignDoubly-Linked List |
| 155. Min Stack | Medium | 61.7% | TopicsStackDesign |
