Hi, I need some help solving this problem from ICPC regionals, 2010,
South America.
http://acmicpc-live-archive.uva.es/nuevoportal/region.php?r=sa&year=2010

Problem K - Kid's Wishes
Each kid may wish to sit down next to at most two other kids, because
each kid has just two neighbors in the circle. The teacher wants to
know whether it is possible to arrange the circle in such a way that
all kids’ wishes are satisfied.

give ideas please. please.
Thanks in advance.

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