Jump Game Minimum Jumps
Given an array of non-negative integers where each element is the maximum jump length, compute the minimum jumps to reach the last index.
Integer to Roman
Convert a positive integer to its Roman numeral representation.
Seat Manager Design
Implement a SeatManager class that supports reserving the smallest available seat and unreserving seats.
Coin change (DP)
Find the minimum number of coins to make exactly the target amount.
Consecutive available seats
Given a list of seat statuses, return the length of the longest consecutive run of available (0) seats.
Non-greedy quantifier
Implement a function that uses a non-greedy regex to extract the shortest substring between two delimiters.
Create Maximum Number
Given two arrays of digits and an integer k, merge them to form the largest number of length k.
Stock Buy Sell Once
Given daily stock prices, compute the maximum profit you can achieve from buying once and selling once later.
Candy Distribution
Compute the minimum total candies needed so that every child gets at least one and children with higher ratings than neighbors get more candies.
Assign Cookies
Given child greed factors and cookie sizes, return the maximum number of content children.
Lemonade Change
Simulate a lemonade stand and decide if you can provide change for each customer using only $5, $10, and $20 bills.
Partition Labels
Partition a string into maximal parts where each character appears in only one part, returning part lengths.
Remove K Digits to Form the Smallest Number
Given a non-negative integer as a string, remove exactly k digits to form the smallest possible integer without leading zeros.
Meeting Rooms Minimum
Given a list of meeting time intervals, compute the minimum number of conference rooms required.
Maximize units on truck
Given box types with count and units per box, maximize total units loaded onto a truck.
Boats to Save People
Given a list of people weights and a boat's weight limit, return the minimum number of boats required.
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.
Minimum Number of Arrows to Burst Balloons
Given balloon intervals, find the minimum number of arrows to burst all balloons by merging overlaps.
Patching Array
Given a sorted array of positive integers and a target n, find the minimum number of patches to make every number from 1 to n representable as a subset sum.
Painter Partition Problem
Given board lengths and k painters, find the minimum possible maximum total length a painter must paint.
IPO Maximize Capital
Given project profits and capital requirements, choose at most k projects to maximize final capital.
Job Sequencing with Deadlines and Profits
Given jobs with deadlines and profits, choose a subset that maximizes profit while meeting deadline constraints.
Gas Station Circuit
Given gas and cost arrays for a circular route, determine the starting gas station index that allows a full loop, or -1 if none exists.
Showing 1–24 of 40 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.