Скачать или смотреть Task 7. Reverse Integer. LeetCode

🏷 In this video, we break down the LeetCode problem “Reverse Integer” using Java —
but not in a boring, textbook way.

This is one of those problems that looks easy…
until you hit 32-bit integer overflow.

We go far beyond just writing code:
we visualize the algorithm,
show why naive solutions fail,
explain how to detect overflow before it happens,
and build a clean, optimal solution using only int.

If you’ve ever been confused by Integer.MAX_VALUE, this video will finally make it click.

🧠 What You’ll Learn

✔ How to reverse an integer without using long or 64-bit types
✔ Why naive solutions break and throw runtime errors
✔ How to safely handle 32-bit integer overflow
✔ The correct overflow checks using Integer.MAX_VALUE / 10
✔ How the algorithm works step by step
✔ Time and space complexity explained visually
✔ A reusable pattern for many LeetCode problems

🎯 What’s Covered in the Video

Positive numbers (e.g. 123 → 321)
Negative numbers (e.g. -123 → -321)
Trailing zeros (120 → 21)
Real overflow case (1534236469 → 0)
Stack-style visualization of digit operations
Naive vs Optimal solution comparison
Overflow explosion animation (why returning 0 is required)

🧩 The Core Idea (High Level)

We repeatedly:
Extract the last digit using % 10
Remove it from the number using / 10
Check for overflow BEFORE multiplying
Append the digit to the result
If overflow is possible — we immediately return 0.
This pattern appears in many interview problems involving numbers and parsing.

📚 Who This Video Is For

🔹 Java beginners
🔹 LeetCode learners
🔹 Interview preparation
🔹 Software engineering students
🔹 Developers who want to understand overflow properly

📌 LeetCode Problem

https://leetcode.com/problems/reverse-inte...
Difficulty: Easy (with a twist)

🧩 Task code:
https://ideone.com/2McID4

👍 If You Found This Helpful

Like the video 👍
Subscribe for more Java & LeetCode explanations 🔔
Comment which problem you want to see next

Upcoming content:

Java algorithms with visualizations
Interview problem patterns
Data structures explained simply
Clean, production-quality solutions

#Java
#LeetCode
#Algorithms
#CodingInterview
#JavaDeveloper
#SoftwareEngineering
#DataStructures
#ReverseInteger
#LeetCodeJava
#Programming
#LearnJava
#InterviewPreparation
#Coding
#ComputerScience
#TechEducation