Word frequency
Return a dict mapping each word to its count in the sentence.
List intersection
Return the sorted list of elements common to both lists.
Group anagrams
Group words that are anagrams of each other.
First non-repeating character
Find the index of the first character that appears only once.
Most frequent element
Return the element that appears most often in a list.
Subarray sum equals K
Count the number of contiguous subarrays whose sum equals k.
Showing 6 challenges · Dicts & Sets
Dicts & Sets — Python coding challenges
What you will find here
This page lists dicts & sets challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.
Challenges vs tutorials and quizzes
Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.