Python coding challenges: "integers"

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Recursion & Backtracking hard

Partition to k subsets

Determine if an array of positive integers can be partitioned into k subsets of equal sum using backtracking.

backtracking recursion partition

+40 pts 35m

Greedy Algorithms hard

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.

greedy arrays prefix-sums

+40 pts 30m

Two Pointers & Sliding Window hard

Trapping Rain Water

Given an array of non-negative integers representing an elevation map, compute how much water it can trap after raining.

array two-pointers water-trapping

+40 pts 30m

Two Pointers & Sliding Window hard

Subarrays with K different ints

Count the number of contiguous subarrays that contain exactly K distinct integers.

sliding-window two-pointers hashmap

+40 pts 40m

Showing 1–4 of 4 challenges · hard

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.

Python Coding Challenges