Most stones removed
Given stone coordinates on a grid, find the maximum number of stones that can be removed while every stone shares a row or column with another remaining stone.
Stock Buy Sell Once
Given daily stock prices, compute the maximum profit you can achieve from buying once and selling once later.
Assign Cookies
Given child greed factors and cookie sizes, return the maximum number of content children.
Bag of Tokens Score
Given tokens with values and initial power, determine the maximum score achievable by selling tokens for power or buying tokens for score.
Maximum Ice Cream Bars
Given costs of ice cream bars and coins, return the maximum number you can buy.
Painter Partition Problem
Given board lengths and k painters, find the minimum possible maximum total length a painter must paint.
Jump Game Reachable
Given an array of non-negative integers where each element is the maximum jump length, determine if you can reach the last index.
Max events attended
Given a list of events with start and end times, find the maximum number of non-overlapping events you can attend.
Ternary Search
Implement ternary search to locate the maximum of a discrete unimodal function.
Maximum Running Time of n Computers
Use binary search to maximize the running time for n computers with batteries.
Binary Search on Answer: Find the Minimal Maximum Subarray Sum
Implement a function that finds the minimal possible maximum subarray sum when splitting an array into at most k contiguous subarrays.
Book Allocation: Minimize Maximum Pages
Implement a function that returns the minimized maximum pages when allocating a list of books to k students.
Minimum Limit of Balls in a Bag
Given an array of bag sizes and a number of allowed splits, find the minimum possible maximum bag size.
Container With Most Water
Given an array of heights, find the maximum area between two vertical lines that can hold water.
Best Time to Buy and Sell Stock
Given a list of daily stock prices, determine the maximum profit achievable by buying on one day and selling on a later day.
Fruit into Baskets
Given an array of integers representing fruit types, return the maximum number of fruits you can collect in a contiguous subarray with at most two distinct types.
Container With Most Water
Compute the maximum area between two vertical lines in an array of heights.
Sliding Window Maximum using Heap
Given an array of integers and a window size k, return an array of maximums for each contiguous subarray of length k.
Maximum Average Pass Ratio
Given class pass/total counts and extra students, maximize the average pass ratio by assigning extra students optimally.
Maximum node value
Return the largest integer or None when empty.
Max Area of Island
Given a 2D grid of 0s and 1s, find the maximum area of a connected group of 1s.
Maximum element in vector
Return largest value or None when empty.
Index of maximum value
Return index of largest value (first on tie).
Showing 25–47 of 47 challenges
Guide: free Python coding challenges
Practice Python by solving problems
PythonSkillset challenges are hands-on coding exercises from beginner to advanced. Open a challenge, read the problem, write Python in the split-pane editor, and run tests with Pyodide — no install required.
How to use the arena
- Pick a category — basics, algorithms, strings, and more
- Open a challenge, read the statement, and edit the starter code
- Run tests, fix failures, then try a related quiz or tutorial lesson
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.