Core Data Structures Checkpoint

Check stacks, queues, hash tables, heaps, and tries by the operations they make efficient.

Scenario

A program needs undo history, fast key lookup, priority scheduling, and prefix search.

Question 1

Which access rule describes a stack?

First in, first outLast in, first outLowest priority firstRandom access only

Question 2

In a binary min-heap, where is the minimum element stored?

At the rootAt the last leafIn every leafOutside the array

Question 3

A hash table has 8 occupied slots and 10 total slots. What is its load factor?

Your answerratio

Question 4

Why is a trie useful for autocomplete?

Words share prefix pathsIt sorts by file sizeIt removes every repeated letterIt guarantees constant memory

Answer keys, scoring tolerance, XP, and awards stay on the server. Retrying the same attempt cannot award twice.

Learn ✦ build ✦ innovate ✦ discover ✦ create

The interactive laboratory for the next generation of scientists, builders, and curious minds.

> status: waiting_for_input

Request a confirmation email for occasional published experiments and learning updates.

Email for lab notes

Website

Double opt-in. Unsubscribe from any newsletter email.