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Matrix Block Sum – 2D Prefix Sum | Running Sum of 2D Array | C++, Java, Python

YouTubeRisingBrain

Matrix Block Sum – 2D Prefix Sum | Running Sum of 2D Array | C++, Java, Python

In this video, we solve the Matrix Block Sum problem using the 2D Prefix Sum technique (Running Sum of a 2D Array). Instead of calculating the sum of every block again and again, we learn how to precompute a prefix matrix so that any block sum can be calculated in constant time. In this video we cover: • Why the brute force approach is ...

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