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Discussion of Problem 1412. Autumn TideAlipov Vyacheslav [Tomsk PU] Ambiguous problem statement (+) [1] // Problem 1412. Autumn Tide 16 Jul 2010 00:40 It's a complete disaster! I just don't get it. 1) Quote: "Exactly 1 mm of precipitations fall down on the pitch each minute" Another quote: "You should output the average amount of precipitations (in millimeters) falling on the pitch in a minute." So the reasonable question is: "Why the answer is just the area of the pitch without a small piece??" It shoud be less than one millimeter! Ammount of precipitations is the height of the water column that arises from the surface in a particular period of time. Hence under the umbrellas the ammount equals to zero. And according to the statement the answer is (1 - area_covered_with_umbrellas / area_of_the_pitch). 2) Quote: "All the water that has fallen on an umbrella streams down along the shortest way on the hemisphere." So what? Does it mean that the water from the umbrella falls back on the pitch without changing the answer? Or, may be, it changes somehow the ammount of precipitations in the area near the umbrella... And if the umbrella is on the border of the pitch, than what ammount of water falls outside the pitch - area of spherical sector or area of its projection or area of spherical sector minus area of the layer falling out of the pitch? BTW None of these variants didn't produce the answer given in the sample output. I'd appreciate any information you could give me to remove an ambiguity. Felix_Mate Re: Ambiguous problem statement (+) // Problem 1412. Autumn Tide 5 Aug 2017 22:46 1)HINT: за счёт зонтов осадков может выпасть больше. 2)"Вся вода попавшая на зонт, стекает по радиусам зонта от центра к краям" и затем падает вертикально вниз. -AlexandeR- ( TNU ) I have wa28, as well as many authors, who knows what is this test?? [5] // Problem 1412. Autumn Tide 29 Mar 2008 12:10 -AlexandeR- (TNU) Re: I have wa28, as well as many authors, who knows what is this test?? [2] // Problem 1412. Autumn Tide 8 Apr 2008 23:34 Help! Eternal Re: I have wa28, as well as many authors, who knows what is this test?? [1] // Problem 1412. Autumn Tide 17 Oct 2008 14:45 Test : 1 2 1 1 0.5 Answer: 1.1339745962155616 AntonFedorov Re: I have wa28, as well as many authors, who knows what is this test?? // Problem 1412. Autumn Tide 15 Apr 2011 20:01 Eternal, your test is incorrect, because the posts on the corners of stadium will not give to the person with umbrella to stand up in this point. Or I am wrong? Edited by author 15.04.2011 20:02 Alex Tolstov (Vologda STU) Re: I have wa28, as well as many authors, who knows what is this test?? // Problem 1412. Autumn Tide 31 Jul 2009 19:09 test 28 is like that: 2 2 1 0 4 correct answer is 4.0 MOPDOBOPOT (USU) Re: I have wa28, as well as many authors, who knows what is this test?? // Problem 1412. Autumn Tide 19 Oct 2012 23:18 Just be careful with distances to borders :) This test helped me: 1 1 1 -0.5 100 Teacher30 2 Admins. About asserts. [2] // Problem 1412. Autumn Tide 26 Feb 2009 16:48 ID=2465032 --> WA 19 ID=2465031 --> Accepted Only difference is some assertion which failed (I use assert() function from <cassert>) Why WA? Why not RE? Fyodor Menshikov Re: 2 Admins. About asserts. // Problem 1412. Autumn Tide 31 Jul 2009 18:35 Maybe "Release" mode disables asserts and you should use your own assert implementation to get RTE? RiaD Re: 2 Admins. About asserts. // Problem 1412. Autumn Tide 11 Jul 2012 18:08 There no checks for return value. RE only when Access Violation and some others things Tkach WA 24? Whats wrong? [3] // Problem 1412. Autumn Tide 3 Nov 2005 22:14 Funny.... in first 23 tests W=L First read y then x coordinate.... Finally got AC! Edited by author 03.11.2005 23:06 LattyF Re: WA 24? Whats wrong? [2] // Problem 1412. Autumn Tide 30 Nov 2005 22:26 Hm… What is it? Is it mistake? I also got WA on 24, but then I swap W and L I got AC. In problem written "The first line contains two integers W and L", but we must read this line as "The first line contains two integers L and W". I think it's mistake :) AntonFedorov Re: WA 24? Whats wrong? // Problem 1412. Autumn Tide 15 Apr 2011 20:24 Really, swap L and W, I passed 24 test. Baster72 Re: WA 24? Whats wrong? // Problem 1412. Autumn Tide 21 Oct 2011 18:22 Thx, i changed L and W and got AC! Fyodor Menshikov Mistake in statement [1] // Problem 1412. Autumn Tide 31 Jul 2009 18:34 People in the stadium area are motionless. There coordinates are known. -> People in the stadium area are motionless. Their coordinates are known. Sandro (USU) Fixed (-) // Problem 1412. Autumn Tide 31 Jul 2009 21:52 Anton Lun'ov Tests are weak yet [1] // Problem 1412. Autumn Tide 9 Mar 2008 02:10 To admins. Add this test please: 1 1 1 0.5 0.1 Because my run with ID 1991789 gives the answer 0.467, my run with ID 1991794 gives the answer 0.075. But both are accepted. P.S. It's very special case. Please, study more carefully case L=W=1. It contains about 7 different situations. Sandro (USU) Your test is incorrect. Read the problem statement. (-) // Problem 1412. Autumn Tide 15 Mar 2008 11:45 Vladimir Yakovlev (USU) Problem 1412 "Autumn tide" has been rejudged (+) [5] // Problem 1412. Autumn Tide 13 Feb 2008 21:26 New tests have been added. Many authors have lost AC. Rafail Ahmadisheff A nice clarification (-) [1] // Problem 1412. Autumn Tide 17 Feb 2008 23:45 It never occured to me, there was a bug in the old solution. Chmel_Tolstiy Re: A nice clarification (-) // Problem 1412. Autumn Tide 2 Mar 2008 04:30 What kind of bug did u have ? Crash_access_violation Re: Problem 1412 "Autumn tide" has been rejudged (+) [2] // Problem 1412. Autumn Tide 19 Feb 2008 13:45 thanks... I got AC... Edited by author 21.02.2008 13:51 Levenets Re: Problem 1412 "Autumn tide" has been rejudged (+) [1] // Problem 1412. Autumn Tide 19 Feb 2008 20:01 Try this test 10000 1000 3 -10000 10000 9999.5 -2000 -3000 9999.5 answer is 10000000.000 Edited by author 19.02.2008 20:02 Edited by author 19.02.2008 20:02 Crash_access_violation Re: Problem 1412 "Autumn tide" has been rejudged (+) // Problem 1412. Autumn Tide 21 Feb 2008 13:49 good test... thank you Levenets... Chmel_Tolstiy Is corner of field can be under umbrella ? [-] // Problem 1412. Autumn Tide 2 Mar 2008 04:27 AC, now ... I can't understand how it was AC before rejudge... admins, nice work. Edited by author 25.03.2008 23:40 Lomir Help to understanf problem... // Problem 1412. Autumn Tide 16 Jul 2007 05:29 Understood. However now WA 25. And do not know why... Edited by author 13.09.2007 03:59 Dembel {AESC USU} Help me! I have got WA#20 [1] // Problem 1412. Autumn Tide 20 Oct 2006 18:45 give me some tests!please Edited by author 31.10.2006 20:21 GeKa Re: Help me! I have got WA#20 // Problem 1412. Autumn Tide 10 Jan 2007 16:35 I had the same problem when used (L - x < 1) condition. After fix to abs(L - x) < 1 I had AC Alexei A. Semenishchev Incorrect statement [3] // Problem 1412. Autumn Tide 22 Nov 2005 13:50 I found the statement of the problem to be incorrect. Concider sample input and sample output. Certainly, the square of the stadium equals 100 sq. meters, but average amount of the rain CAN NOT be 99.666, since it is calculated as total volume (or mass) of the water divided by square of the stadium. Therefore, it can not be greater that 1 mm. May be you mean TOTAL VOLUME (measured in mm^3) in your question? Dryad Re: Incorrect statement // Problem 1412. Autumn Tide 21 Feb 2006 21:43 That must be true. What a huge bug!! ( is it still a bug? ) Peter Ivanov Re: Incorrect statement [1] // Problem 1412. Autumn Tide 26 Aug 2006 17:51 I think there is nothing with volumes, but the statement is still wrong: maybe the input details are all given in millimeters - then the result is correct. PSV Re: Incorrect statement // Problem 1412. Autumn Tide 22 Oct 2006 01:05 As I now understand 1 mm per minute its normal watering, but when we have some umbrelas some water doesnt fall under ubmberlas and other part of stadium have much watering. Or what? Piratek-(akaDK) Help to understand what the problem in? // Problem 1412. Autumn Tide 7 Aug 2006 21:47 I did not understand what i must found! Please Help!
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