Merge intervals
Merge all overlapping intervals and return a sorted result.
Merge time intervals
Given a list of time intervals, merge all overlapping intervals and return the merged intervals.
Meeting Rooms Minimum
Given a list of meeting time intervals, compute the minimum number of conference rooms required.
Minimum Number of Arrows to Burst Balloons
Given balloon intervals, find the minimum number of arrows to burst all balloons by merging overlaps.
Non-overlapping Intervals
Given a list of intervals, return the minimum number of intervals to remove to make the rest non-overlapping.
Interval List Intersections
Given two lists of sorted, disjoint intervals, return the list of intersections between them.
Task Scheduler Heap
Given a list of tasks and a cooldown, find the minimum number of CPU intervals needed to schedule all tasks without violating the cooldown.
Meeting Rooms II with Heaps
Given a list of meeting intervals, compute the minimum number of rooms required using a heap-based approach.
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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.