Practice problems across 75+ categories
Practice problems frequently asked at Trie • 59 problems | 5 Easy | 25 Medium | 25 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Add Bold Tag in String | Medium | ArrayHash TableString |
| 2 | Bold Words in String | Medium | ArrayHash TableString |
| 3 | Camelcase Matching | Medium | ArrayTwo PointersString |
| 4 | Concatenated Words | Hard | ArrayStringDynamic Programming |
| 5 | Construct String with Minimum Cost (Easy) | Unknown | StringTrieDynamic Programming |
| 6 | Count Pairs With XOR in a Range | Hard | ArrayBit ManipulationTrie |
| 7 | Count Prefix and Suffix Pairs I | Easy | ArrayStringTrie |
| 8 | Count Prefix and Suffix Pairs II | Hard | ArrayStringTrie |
| 9 | Delete Duplicate Folders in System | Hard | ArrayHash TableString |
| 10 | Design Add and Search Words Data Structure | Medium | StringDepth-First SearchDesign |
| 11 | Design File System | Medium | Hash TableStringDesign |
| 12 | Design In-Memory File System | Hard | Hash TableStringDesign |
| 13 | Design Search Autocomplete System | Hard | StringDepth-First SearchDesign |
| 14 | Distinct Echo Substrings | Hard | StringTrieRolling Hash |
| 15 | Encrypt and Decrypt Strings | Hard | ArrayHash TableString |
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