Word ladder length
Return the length of the shortest transformation from beginWord to endWord changing one letter at a time.
Longest Consecutive Sequence
Given an unsorted list of integers, find the length of the longest consecutive elements sequence in O(n) time.
Median of Two Sorted Arrays
Given two sorted arrays, return the median of the combined sorted array in O(log(min(n,m))) time.
Merge time intervals
Given a list of time intervals, merge all overlapping intervals and return the merged intervals.
Delete Old Records
Filter a list of records by removing those with a date older than a given cutoff date.
Delete Middle Node
Implement a function that deletes a given non-tail node from a singly linked list in O(1) time.
Showing 1–6 of 6 challenges · Data Structures & Algorithms
Data Structures & Algorithms — Python coding challenges
What you will find here
This page lists data structures & algorithms 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.