Start Here
Learn Python

Start Learning
Your Learning Plan →Your personalized Python learning plan Python Tutorials →In-depth articles and video courses Learning Paths →Guided study plans for accelerated learning

Practice
Quizzes & Exercises →Check your learning progress Browse Topics →Focus on a specific area or skill level Reference →Concise definitions for common Python terms

Get Help
Mentor AI →NewYour personal Python mentor Office Hours →Live Q&A calls with Python experts Community Chat →Learn with other Pythonistas

Go Deeper
Live Courses →Live, instructor-led Python courses Books →Round out your knowledge and learn offline Podcast →Hear what’s new in the world of Python

Unlock All Content and Become a Python Expert →Get unlimited access to all Real Python has to offer

Unlock All Content →Become a Python Expert
More
Learner Stories Python Newsletter Python Job Board Meet the Team Become a Contributor

Search

/

Join
Sign‑In

Loading exercise...

Exercise: Matching Character Counts

Martin Breuss

Python Coding Interview Practice: Hashing, Pointers, and Windows Martin Breuss 08:00

Python Time and Space Complexity Cheat Sheet (.pdf)

Ask a Question

Contents
Discussion

Become a Member to join the conversation.

Course Contents

Overview

25%

Practice With a Plan 05:00

Remember What You Have Seen 03:30

Exercise: Repeated Values 08:00

Exercise: First Unique Character 08:00

Exercise: Matching Character Counts 08:00

Exercise: Target Pair Positions 08:00

Exercise: Shared Inventory 08:00

Exercise: Consecutive Value Run 08:30

Look Back at What You Stored 13:00

Move Two Positions With a Purpose 03:30

Exercise: Mirror Text 08:00

Exercise: Merge Ordered Readings 09:00

Exercise: Compact Repeated Values 08:00

Exercise: Move Empty Slots 08:00

Exercise: Ordered Target Pair 08:00

Exercise: Nearly Mirrored Text 10:00

Check Why Each Move Was Safe 14:00

Reuse a Moving Region 03:30

Exercise: Largest Fixed Total 08:00

Exercise: Vowel Window 08:00

Exercise: Longest Unique Segment 08:00

Exercise: Limited Character Variety 09:00

Exercise: Shortest Positive Total 08:00

Exercise: Rearranged Pattern Match 08:30

Retrace How Your Windows Moved 13:30

Exercise: Nearby Repeat 09:00

Exercise: Shared Ordered Readings 09:30

Read the Constraints Behind Your Choices 11:30

Mock Interview: Talk Through a Warm-Up Problem 22:00

Python Coding Interview Practice: Hashing, Pointers, and Windows (Quiz) 08:30

Practice Again With a Fresh Example 02:30

© 2012–2026 Real Python ⋅ Privacy Policy