Radix Sort Algorithm in DSA Javascript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Radix Sort?

Radix Sort is a sorting method that sorts numbers digit by digit, starting from the least significant digit to the most significant digit.

beginner

How does Radix Sort handle sorting of numbers?

It groups numbers by each digit using buckets, sorts them by that digit, and repeats for each digit until all digits are processed.

intermediate

Why is Radix Sort efficient for sorting integers?

Because it sorts numbers by digits without comparing whole numbers, making it faster than comparison-based sorts for large lists of integers.

intermediate

What is the time complexity of Radix Sort?

The time complexity is O(d * (n + k)) where d is the number of digits, n is the number of elements, and k is the range of digits (usually 10).

advanced

Can Radix Sort be used for sorting strings?

Yes, Radix Sort can sort strings by processing characters from right to left, similar to digits in numbers.

Radix Sort processes digits starting from which position?

A Least significant digit

B Most significant digit

C Middle digit

D Random digit

Radix Sort starts sorting from the least significant digit to ensure correct order after all digits are processed.

What data structure is commonly used in Radix Sort to group numbers by digit?

A Stack

B Queue

C Linked list

D Buckets or arrays

Buckets or arrays are used to group numbers by their current digit during each pass.

Which of these is NOT true about Radix Sort?

A It compares whole numbers directly.

B It sorts digit by digit.

C It can be faster than comparison sorts for integers.

D It uses stable sorting at each digit.

Radix Sort does not compare whole numbers directly; it sorts based on individual digits.

What is the main advantage of Radix Sort over comparison-based sorts?

A It uses less memory.

B It can sort in linear time for fixed digit size.

C It sorts in place.

D It works only on strings.

Radix Sort can achieve linear time complexity when the number of digits is fixed.

Radix Sort is best suited for which type of data?

A Random strings of varying length

B Floating point numbers with many decimals

C Large integers with fixed digit length

D Unsorted linked lists

Radix Sort works best on large integers with fixed digit length because it processes digits uniformly.

Explain how Radix Sort sorts a list of numbers step-by-step.

Think about sorting by each digit one at a time.

Describe the advantages and limitations of Radix Sort compared to other sorting algorithms.

Consider speed and data types it works best with.