Need help with validator

Правка en1, от WORLD_OF_TANKS, 2016-04-27 15:14:44

Hello CodeForces =)
Today I was preparing problem in Polygon. And I wanted to know about validator. How to write validator?

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en1 Английский WORLD_OF_TANKS 2016-04-27 15:14:44 153 Initial revision (published)