Practice Arena

Python Coding
Challenges

Write real Python in the browser. Instant feedback. From beginner to expert.

577 challenges 370 easy 180 medium 27 hard

All Easy Medium Hard

All Python Basics Strings & Text Lists & Arrays Dicts & Sets Functions & Closures OOP & Classes Data Structures & Algorithms Advanced Python Iterators & Generators Decorators & Context Managers Error Handling & Exceptions Regular Expressions Math & Number Theory Bit Manipulation Dynamic Programming Trees & Binary Trees Graphs & Graph Algorithms Recursion & Backtracking Greedy Algorithms Binary Search Two Pointers & Sliding Window Stacks & Queues Heaps & Priority Queues Linked Lists Matrix & 2D Arrays Datetime & Time Calculations Data Formats & Parsing SQL & SQLite Numpy & Vectorized Computing Cryptography & Hashing

Two Pointers & Sliding Window easy

Two Sum Sorted

Given a 1-indexed sorted array and a target, return the two indices that add up to the target.

two-pointers sorted-array array

Two Pointers & Sliding Window easy

Squares of Sorted Array

Implement a function that returns a sorted list of squares for a given non-decreasing integer array.

two-pointers sorting array

Two Pointers & Sliding Window medium

Interval List Intersections

Given two lists of sorted, disjoint intervals, return the list of intersections between them.

two-pointers intervals merging

Showing 3 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.