Prefix Sum, Explained From Zero (Range Sums in O(1))
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YouTubeUnrote
Prefix Sum, Explained From Zero (Range Sums in O(1))
Prefix sums turn a whole range of numbers into a single subtraction. In this video we build the idea from absolute zero, assuming nothing, and end up with a tool you will reach for again and again. We start with a problem you meet everywhere: given an array, answer "what is the sum from index i to index j" over and over. The obvious approach re ...
3 weeks ago
Prefix Sum Applications
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