Web Reference: Aug 20, 2024 · This is where the concept of a difference array comes into play. In this article, we’ll explore what a difference array is, how it works, and where you can use it to optimize your code. Jul 30, 2025 · In the previous implementation, we used an extra array (diff []) to track range updates and another result array to store the final output. But if memory is a concern, and you're allowed to modify the original array, you can implement the same logic in-place without using any extra space. Mar 13, 2025 · The Difference Array Technique is a game-changer when handling multiple range updates efficiently. Instead of modifying each element in a range, we just update two points and use a prefix sum. This reduces the update time from O(n) to O(1), making it ideal for large-scale problems.
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