A simple HashMap-based problem, such as:

Counting frequencies of elements in an array

Finding the first non-repeating character in a string

Detecting duplicates in a list using a dictionary

Language Used: Python (or language of choice)

Question

A simple HashMap-based problem, such as:

Counting frequencies of elements in an array

Finding the first non-repeating character in a string

Detecting duplicates in a list using a dictionary

Language Used: Python (or language of choice)

Wipro