# New Problems, Your Choice

Seven tickets the course hasn't shown you, from a plane's seat map to a spreadsheet that recalculates: choose the structure for each on your own, one of them needing two structures working together, then open the answer and compare your reasons.

![Cheat sheet: New Problems, Your Choice](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/11/3d871484e64e43b7b08bd89a5e1992fb.webp)

- Category: Data Structures
- Level: Journeyman
- Tags: Big-O Notation, Data Structure, data structures, LRU Cache
- Updated: November 3, 2026

Source: https://www.ask-codey.com/cheat-sheets/ds-new-problems-cheat-sheet