Create Sorted Array through Instructions | LeetCode hard C++ Solution Explained

Published: 07 September 2025
on channel: Coding theory

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In this video, we solve LeetCode 1649 – Create Sorted Array through Instructions using C++.
We explain the problem step by step and implement an efficient solution using a Fenwick Tree (Binary Indexed Tree) with O(n log n) complexity.

🔹 Problem Explanation:

Insert elements into a sorted array.

Cost = minimum of elements less than the number OR greater than the number.

Return total cost modulo 1e9+7.

🔹 What you will learn in this video:
✔️ How to use Fenwick Tree (BIT) in C++.
✔️ Efficient way to count smaller and greater elements.
✔️ Complete C++ code implementation.

If you are preparing for coding interviews or practicing LeetCode problems, this video will help you understand the logic clearly.

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