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Stepanov's biggest blunder? The curious case of adjacent difference

news.ycombinator.com Roman Kashitsyn 2025-10-28 04:30:59

The curious case of adjacent difference If you have ever tried using the std::adjacent_difference algorithm in c++, I’m sure it left you puzzled. As the name suggests, this algorithm computes differences between adjacent elements of the input sequence, but it does one more thing: it copies the first element of the input sequence into the output sequence unmodified. The following example demonstrates how to apply the algorithm to delta-compress a postings list of document identifiers that contain

Topics: adjacent_difference partial sequence std sums
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Extending That XOR Trick to Billions of Rows

news.ycombinator.com Unknown 2026-01-04 14:15:41

Can we extend the XOR trick for finding one or two missing numbers in a list to finding thousands of missing IDs in a billion-row table? Yes, we can! This is possible using a data structure called an Invertible Bloom Filter (IBF) that compares two sets with space complexity based only on the size of the difference. Using a generalization of the XOR trick [1], all the values that are identical cancel out, so the size of this data structure depends only on the size of the difference. Most explan

Topics: difference ibf set trick xor
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Signs of autism could be encoded in the way you walk

news.ycombinator.com The Conversation 2026-01-11 08:43:35

Autism is a neurodevelopmental condition that affects how people's brains develop and function, impacting behaviour, communication and socialising. It can also involve differences in the way you move and walk – known as your gait. Having an "odd gait" is now listed in the Diagnostic and Statistical Manual of Mental Disorders as a supporting diagnostic feature of autism. What does this look like? The most noticeable gait differences among autistic people are: toe-walking, walking on the balls

Topics: autistic children differences gait support
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Signs of Autism Could Be Encoded in the Way You Walk

news.ycombinator.com The Conversation 2026-01-12 14:43:35

Autism is a neurodevelopmental condition that affects how people's brains develop and function, impacting behaviour, communication and socialising. It can also involve differences in the way you move and walk – known as your gait. Having an "odd gait" is now listed in the Diagnostic and Statistical Manual of Mental Disorders as a supporting diagnostic feature of autism. What does this look like? The most noticeable gait differences among autistic people are: toe-walking, walking on the balls

Topics: autistic children differences gait support
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Sequence and first differences together list all positive numbers exactly once

news.ycombinator.com Unknown 2026-02-10 21:59:12

EXAMPLE Sequence reads 1 3 7 12 18 26 35 45..., differences are 2 4 5, 6, 8, 9, 10 ... and the point is that every number not in the sequence itself appears among the differences. This property (together with the fact that both the sequence and the sequence of first differences are increasing) defines the sequence!

Topics: 10 18 35 differences sequence
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