Inspired by Problem 1827 by Andrew Newell.

Write a function that has the following property:

(x~=y)

neg3(x)=x;

neg3(y)=y;

neg3(x)=-x;

neg3(y)=-y;

...

The test suite is simple. The goal is just to obtain a general method.

Solve

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Last Solution submitted on Apr 14, 2026

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George Berken Ramon Villamangca Christian Schröder Lorenzo

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