IMO Shortlist 1984 problem 1


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2. travnja 2012.
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Find all solutions of the following system of n equations in n variables: \begin{align*}
x_{1}|x_{1}|-(x_{1}-a)&|x_{1}-a| = x_{2}|x_{2}|, \\
x_{2}|x_{2}|-(x_{2}-a)&|x_{2}-a| = x_{3}|x_{3}|, \\
&\vdots \\
x_{n}|x_{n}|-(x_{n}-a)&|x_{n}-a| = x_{1}|x_{1}| \\
\end{align*}
where a is a given number.
Izvor: Međunarodna matematička olimpijada, shortlist 1984