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Discussion of Problem 1690. Army of Mages

Here's a hint
Posted by jk_qq 21 Sep 2015 23:53
This problem is very easy, try to solve it when 4 * (n-1) + 1 points are given.
Re: Here's a hint
Posted by Otrebus 24 May 2016 02:49
Another hint: imagine if you got n points and you could cheat and make them all respect each other by stretching or compressing the coordinate grid (while keeping the points static); what would be the simplest way to transform the grid? In this problem you can't cheat like that, but on the other hand you only need to have n/5 points work together.