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Walsh hadamard transform: difference wing · case 03
The exact walsh hadamard transform result violates the stated contract at difference wing.
Case contract
Input integer list of power-of-two length; return unnormalized Sylvester-ordered Walsh-Hadamard transform. Bounds: length<=1024.
Why this case matters
Exact discrete arithmetic with observable algorithmic state; no floating point approximation is used.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| explicit oracle 0 | [5, 1] | [5, -1] | Failed |
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