What do you know about real Mathforces? This is a world full of numbers, theorems and formulas. Are you ready for the adventure full of challenges and dangers in a new world?

Our friends from Harbour.Space University, the International Tournament of Young Mathematicians (ITYM) and St. Paul's International School Barcelona for the second time organize Tech Scouts — two week International summer camp for high school students. I really think it is a valuable and useful initiative.

For some participants the organizers cover participation fee, the decision is based on the results in special online math test and phone interview.

I invite you to take part in Mathforces: Tech Scouts Online Test 2018 (just fun and practice, unofficial, unrated). It was offered to candidates a year ago, in 2018. This year participants can use it as a practice. I think for many of you it will be interesting to compare your math skills. It starts on May/05/2019 11:05 (Moscow time).

The duration of the test will be 2 hours. You will be offered about 20 math questions. Each of them are expected to be solved using math skills. **Please refrain from writing code and try to solve problems without any programming.**

You can skip questions or re-submit answers during the test. All the answers will be judged after the test ends. Each question costs 1-3 points in case of the correct answer. Please, do not share your answers before the end of the test.

For sure, **the test will be unrated**.

Please refrain from participation if you have already participated in this test last year.

**UPD 1:** The problems will be in English.

**UPD 2:** The tutorials are published.

If only I could take part in Harbour Space Summer School...

Math, math everywhere!

Mathforces again?

rated please

Math is LOVE!

Exciting.

just

funandpractice))If the answer is unreasonable, how do you express it?

There's no such problem, sorry...

I suggest in problems like S writing degrees as

`^{\circ}`

like $$$90^{\circ}$$$, not`^o`

like $$$90^o$$$.Enjoyed a lot. Thanks!

That was a great time solving problems :)

We must keep having Mathforces rounds similar to Codeforces regular rounds :)

In fact, Codeforces regular rounds can be Mathforces.

Uhhh... a (Math+Code)forces? :P

No... I'm just joking about the CP problems which are considered full of math.

Can I submit after the contest is over?

How to solve U?

http://codeforces.com/blog/entry/66884

My solution: Essentially the problem is: find largest y for which we can find valid x, that is for which polynomial $$$P(x) = x^5-20xy+y^5$$$ has a positive root. It is positive at $$$0$$$ and for $$$x \to \infty$$$, so we need to check if it has a negative value anywhere. Just find its minimal value using derivatives, compare it to $$$0$$$ and we're done. Not that hard to get through all the calculations

Wow!! I loved this one. Although I missed first 30 m.

It was great. is there any tutorial?

http://codeforces.com/blog/entry/66884

Can someone explain to me the "2018 Integers" problem?

My logic was to set one of the points to 1 and all others to 0 and calculate how many sequences include 1. There is 1 seq. that has 2018 pts, 2017 seqs that has 2017 pts, 2016 that has 2016 pts and so on we can conclude that the answer is 2017*2018/2 + 1.

Tutorial link if my soln was not clear enough: http://codeforces.com/blog/entry/66884

why its not allowing to submit the solutions now ??

The answers for the problems are all in the tutorial, there is no need to submit them.

That means, for other contests(CR, ECR, etc), "The solutions of the contest are all in the tutorial, so Virtual participation isn't needed." :(

@anzuof , If that's the case ,why do you participate in contests when you can see the solution after the contest in editorials !! ??

I don't see what you mean, contests are much different from practicing. This editorial is different to editorial to programming contests because the solution to the problems is just one plain answer, it doesn't depend on some custom input, of which you have too many to handle them all by themselves. But one problem I see with using the editorials instead of a judge on these math questions is that you can't get a WA without finding out the correct answer of the problem, that's unfortunate

But before moving on to editorial , we can atleast give it a try to check our logic/method .

Yeah you are right, editorials still expose too much information

Enjoyed a lot. Thanks a lot!!!!

Open it for practice, please.

How an we calculate B?

I assumed the triangle in question is equilateral then calculated the areas of the three small triangles and then extracted from total.

Area of triangle can be found from 2 sides and angle between them. Every little triangle is 3/16 from big triangle.

Why there is no virtual participation for this contest?

How can I submit for practice or participate virtually?

same question

Why I can’t submit the answer after the contest because of NO Registered

How can I solve problems after the contest?

This is very enjoyable contest!!

Want this type of contest again.

please make mathforces sitel ololololol

I want to try this virtually please help me out. Not being able to do so is frustrating

Please allow to submit answers now (after contest)!

How can i submit my answers now ? When I am submitting , its showing " You can not submit answers after the end of the contest. Please register for practice to submit answers ". Please someone tell me how to "register for practice" .

How can I submit ?!!!!!

Please allow Virtual Participation for the contest !!!Its very interesting...When started Mathforces again?

Twoquestions:Spoiler(please make it available for prcatise)

SpoilerPlease create atleast once again