Hakerrank: Correctness and the Loop Invariant

👋 Hey everyone! In this video, we'll solve the 'Correctness and the Loop Invariant' problem on Hackerrank.

🤔 First, we'll understand the insertion sort algorithm and its time complexity.

🔍 Next, we'll analyze the incorrect implementation and identify the flaw in its logic.

🔄 Using the concept of a loop invariant, we'll derive the corrected implementation of the algorithm that works correctly for all inputs.

🎯 Finally, we'll implement and test the corrected algorithm on some sample inputs.

By the end of the video, you'll have a solid understanding of how to correct an incorrect implementation of an algorithm using a loop invariant.

Let's get started! 🚀
00:00 Introduction
00:54 Insertion sort principe
02:03 Analyze base code
03:42 Fixing base code