yuaksoinocenow's blog

By yuaksoinocenow, history, 3 months ago, In English

Good day, Codeforces!

Given a polygon with N vertices, where the vertices(x[i], y[i]) are listed in counterclockwise order, you need to check if an angle is concave in the polygon. To better understand what is meant, refer to the provided illustrations:

By (ABC) I will mean the angle where B is the vertex of the angle, and A and C are the sides of the angle.

In that pic, (AFE) and (EDC) are concave angles.

Sorry for my bad English, any help will be appreciated.

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By yuaksoinocenow, history, 7 months ago, In English

Hi, guys!

Can solving problems only from IOI-style olympiads (like POI, JOI, IOI, IZHO, etc.), help me to be ready for any IOI-style olympiad? And which OI would you suggest to solve?

Personally, I've heard that POI is great for getting better.

Please, share with your opinion, 'cause I want to hard-work in summer.

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