Online Coding Lessons Data Structures and Algorithms

Question 1

What is an array in programming?

Accepted Answer

A collection of elements stored at contiguous memory locations

Answer

A single variable that holds one value

Answer

A function that sorts numbers

Answer

A type of loop

Question 2

What is the time complexity of a linear search algorithm?

Accepted Answer

O(n)

Answer

O(1)

Answer

O(log n)

Answer

O(n²)

Question 3

What is a stack data structure?

Accepted Answer

A structure where elements follow Last-In-First-Out (LIFO) order

Answer

A structure where elements are added and removed from the front

Answer

A sorted list of elements

Answer

A collection of key-value pairs

Question 4

Which sorting algorithm works by repeatedly swapping adjacent elements if they are in the wrong order?

Accepted Answer

Bubble Sort

Answer

Merge Sort

Answer

Quick Sort

Answer

Insertion Sort

Question 5

What is a queue data structure?

Accepted Answer

Elements follow First-In-First-Out (FIFO) order

Answer

Elements are removed from where they were added

Answer

Elements are sorted automatically

Answer

A hierarchical structure

Question 6

What does 'index' mean in the context of an array?

Accepted Answer

The position of an element within the array

Answer

The total number of elements

Answer

The value stored in the array

Answer

The type of data stored