Hi Codeforces,

I hope you enjoyed the contest despite the difficulty. Do not hesitate to ask questions and discuss the problems here. :)

If you participated, I would really appreciate if you could fill in this short form. It only takes 1 minute and will be useful for my thesis. https://goo.gl/forms/XPfkoRxRjEKmTDt32

Editorial: https://vlecomte.github.io/set/geo18/editorial.pdf

Example solutions:

• A: https://pastebin.com/kr3jc1qZ
• B: https://pastebin.com/mhz6J0bW
• C: https://pastebin.com/JMdQg4Dr
• D: https://pastebin.com/bQUTXGG8

Thanks to all who participated! :)