Generate Parentheses
Given n, generate all valid strings of n pairs of parentheses.
Remove invalid parentheses
Given a string with parentheses and letters, return all valid strings after removing the minimum number of invalid parentheses.
Showing 1–2 of 2 challenges · Recursion & Backtracking
Recursion & Backtracking — Python coding challenges
What you will find here
This page lists recursion & backtracking 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.