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3:47
YouTube
The Logic Blueprint
Prefix Sums Explained Visually | Range Sum Queries in O(1)
Prefix sums are one of those ideas that look simple, but unlock a huge number of fast solutions. In this video, I explain prefix sums visually from first principles: - how to build the prefix array in one pass - how to answer range sum queries in O(1) - why the subtraction formula works - how 2D prefix sums extend the same idea to grids - how ...
46 views
1 month ago
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