Longest Substring Without Repeating Characters
Implement a function that returns the length of the longest substring without repeating characters.
Reverse Pairs Count
Implement a function to count reverse pairs in an array efficiently.
Squares of Sorted Array
Implement a function that returns a sorted list of squares for a given non-decreasing integer array.
Boats to Save People – Two Pointer
Implement a function that returns the minimum number of boats needed to rescue everyone, given a weight limit and each boat carrying at most two people.
Showing 1–4 of 4 challenges · Two Pointers & Sliding Window
Two Pointers & Sliding Window — Python coding challenges
What you will find here
This page lists two pointers & sliding window 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.