Subarray Sum Divisible by K – Optimal Approach Using Prefix Sum + HashMap | C++, Java, Python
Автор: RisingBrain
Загружено: 2026-03-10
Просмотров: 369
Описание:
In this video, we solve the Subarray Sum Divisible by K problem and understand the intuition behind the optimized approach.
Instead of checking every subarray, we use the prefix sum technique along with a HashMap to efficiently count the number of subarrays whose sum is divisible by K.
In this video we cover:
• Brute force intuition and why it is inefficient
• Key observation using prefix sum
• Why equal remainders help us find valid subarrays
• How HashMap stores remainder frequencies
• Clean implementation in C++, Java, and Python
This problem is a very important extension of prefix sum concepts and is frequently asked in coding interviews.
Rising Brain (DSA Sheet) - https://www.risingbrain.org/sheet
Connect with me here:
Linkedin - / anjalikumari22
Instagram - / rbanjali.codes
Twitter - https://x.com/anjali1kumari?s=21
Повторяем попытку...
Доступные форматы для скачивания:
Скачать видео
-
Информация по загрузке:
