| ENG RUS | Timus Online Judge |
Discussion of Problem 1372. Death StarSpBerkut Do I understand that problem can solved without mass? // Problem 1372. Death Star 13 Nov 2012 19:09 I need to cаlculate sum of torques about axes, right. T = ∑F·d = 0, where T is torque, F is vector of force, d is distance from F to center of sphere. Is it right? svr 1372- Ambiguous solution? [4] // Problem 1372. Death Star 28 Jun 2007 10:01 It seems that this problem very simple. Let F=[v1,F1]+...+[vN,FN]- sum of moments of forces, where vi=(cos(fi)cos(hi),cos(fi)sin(fi),sin(fi))- vector of point and Fi=(cos(qi)cos(zi),cos(qi)sin(zi),sin(qi))- vector of force Fi. Let V,G- point and force to be found. Then we have [V,G]=-F,|G|->min; We must have V- is normal to F=>V any point on meridian and G=-[V,F]-calculated after Thus solution ambiguous even with demand |G|->min Sandro (USU) Re: 1372- Ambiguous solution? [3] // Problem 1372. Death Star 28 Jun 2007 15:06 And why do you think that this problem must have an unique answer? Any correct answer will be OK. svr Re: 1372- Ambiguous solution? [2] // Problem 1372. Death Star 28 Jun 2007 15:39 Because when many solutions how can we check that difference with test's answer <=1E-8 Sandro (USU) Re: 1372- Ambiguous solution? [1] // Problem 1372. Death Star 28 Jun 2007 22:59 This problem has special checking program. It doesn't use the difference between your answer and jury's one. Al.Cash Why so few ACs?? // Problem 1372. Death Star 19 Jun 2009 20:03 Everything needed to solve this problem is told in the first post! And there is only simple 3D-geometry. Alias (Alexander Prudaev) misprint in statement, admins please read this message [1] // Problem 1372. Death Star 1 Apr 2007 23:43 int russian variant of statement word "engine" in line: "Next line of input contains krypton engine description" is written twice Далее идет информация о работающих криптоновых двигателях двигателях Sandro (USU) Thank you. (-) // Problem 1372. Death Star 2 Apr 2007 01:16 Igor Dex Clarification is required. [2] // Problem 1372. Death Star 27 Sep 2005 17:25 1 What is the precision of the output required in this problem? There are 8 digits in the text, but only 2 digits in the sample output. 2 It's not clear if it is possible to use the jet thrust less than 1 or more than 100000? Edited by author 06.10.2005 04:46 Edited by author 14.10.2005 12:02 Igor Dex Re: Clarification is required. // Problem 1372. Death Star 14 Oct 2005 12:01 Kit (Vologda SPU) Re: Clarification is required. // Problem 1372. Death Star 14 Oct 2005 17:54 1. 270.00 is equal to 270.00000000. Are you agree? 2. Don't worry about it. {AESC USU} UdH-WiNGeR Sample [2] // Problem 1372. Death Star 30 Sep 2005 23:29 I think the sample of this problem is incorrect. My AC program outputs: 0.00000000 0.00000000 270.00000000 0.00000000 156.50000000, but sample output is oposite to this P.S. sorry for my poor English.. Kit (Vologda SPU) Re: Sample [1] // Problem 1372. Death Star 1 Oct 2005 00:57 It seems, you are right. Probably, misprint. Vladimir Yakovlev (USU) Fixed (+) // Problem 1372. Death Star 12 Oct 2005 01:31 First number in the sample output was replaced by "0.00"
|