Discussion @ 1722. Observation Deck @ Timus Online Judge

Alias aka Alexander Prudaev What we must to find ? [10] // Problem 1722. Observation Deck 17 Oct 2009 22:52

I do not understand why, but my program gives
different result, than sample.

in this picture, i draw a figure with yellow,
i think area of this figure is an answer, i am right ?
download this picture:
http://slil.ru/28091271

svr Re: What we must to find ? [1] // Problem 1722. Observation Deck 17 Oct 2009 23:21

Question is simple.
H is not diven then we have plane problem.
Two adjacent, rejion after antey+ antey itself.

Alias aka Alexander Prudaev No subject // Problem 1722. Observation Deck 18 Oct 2009 00:40

i do not understand you

melkiy Re: What we must to find ? [7] // Problem 1722. Observation Deck 18 Oct 2009 01:44

You filled with yellow only the area behind the new building. But the big inner circle must be included in "non-seen" region as well.

Oleg Strekalovsky aka OSt [Vologda SPU] Re: What we must to find ? [6] // Problem 1722. Observation Deck 18 Oct 2009 16:16

I think, that this problem can be solved only via integrals.
Analytic geometry doesn't work. I am right?

svr Re: What we must to find ? [5] // Problem 1722. Observation Deck 18 Oct 2009 16:25

No!i tried to use integral during contest: WA8- rounding error.
At the next day I found simple analytic solution.

Oleg Strekalovsky aka OSt [Vologda SPU] Re: What we must to find ? [4] // Problem 1722. Observation Deck 18 Oct 2009 17:02

Are you sure, that it is simple solution? =)
A think, that main problem is that we can't make any Circle Sector, except sector from the center of town, so we can't find exact area behind New Antey Building. Areas of figures with rounded border are hardly calculated.

svr Re: What we must to find ? [3] // Problem 1722. Observation Deck 18 Oct 2009 17:14

The figure can be decomposed into triangles and
circle segments. All lengths and , therefore areas
are easy calculated, typical school problem.

Edited by author 18.10.2009 17:15

Oleg Strekalovsky aka OSt [Vologda SPU] Re: What we must to find ? // Problem 1722. Observation Deck 20 Oct 2009 13:18

Solution on Java exists!
No problems with accuracy of calculating.

uzairBaig Re: What we must to find ? [1] // Problem 1722. Observation Deck 24 Apr 2010 17:17

the link for the diagram has expired
can anyone draw a figure and upload again, the area to find out is unclear to refer to from the question.

ASK Re: What we must to find ? // Problem 1722. Observation Deck 11 Apr 2018 19:21

The new tower blocks its own area plus all the town behind it. This sum needs to be divided by (pi * R**2) and multiplied by 100.

Joseph Puh the Battle Bear Is it true that my AC program is wrong? Pls, check it [2] // Problem 1722. Observation Deck 3 Mar 2012 17:08

Dmitry "Logam" Kobelev [TSOGU] precision ? or wrong idea? [6] // Problem 1722. Observation Deck 25 Oct 2009 00:11

Discussion of Problem 1722. Observation Deck