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Обсуждение задачи 1458. Военные ученияPSV Gimme some ideas [11] // Задача 1458. Военные учения 4 июл 2006 16:25 I can't understand how can it take 1 sec to solve for N = 1000 My biggest ideas is something like a system of equations by modulo 2, but ... Some hints please... PSV Please [10] // Задача 1458. Военные учения 5 июл 2006 05:49 Please one small pour hint PSV Re: Please [9] // Задача 1458. Военные учения 7 июл 2006 00:24 Please. I still have any ideas. May be finding of circles? WinTokk Re: Please [8] // Задача 1458. Военные учения 8 июл 2006 19:31 linear module equations will work. try to rewrite it into a simpler form and you will achieve it! SPIRiT Where can I read about solving linear module equations?(+) [7] // Задача 1458. Военные учения 27 сен 2007 21:11 I found a lot of material about modular arithmetic itself, but nothing about systems of equations modulo 2. There is a problem 1042 that I solved using an intuitive algo. But I don't have any materials about those kind of problems... Any links in Internet are available. svr Re: Where can I read about solving linear module equations?(+) [6] // Задача 1458. Военные учения 27 сен 2007 21:49 I haven't AC but sure that 1458 is a problem with great mathematical background. In matrix language Sulman command is equal to transformation of tipe A[j]*B*A[k] where A[j]=diag[1,1,1,...,-1,1,1,1,1..] So, read about minimal step of transformations to standard form. Also, sequence of such transformation is code for arbitrary 0-1 matrix. Sure that authors create the problem during reading about 0-1 matrix, transformations and coding. KAJIAIII Re: Where can I read about solving linear module equations?(+) [5] // Задача 1458. Военные учения 27 сен 2007 22:20 You're A LOOSER.I've done this program to 1 minute!!! svr Re: Where can I read about solving linear module equations?(+) [1] // Задача 1458. Военные учения 27 сен 2007 22:45 Each has It's own way and all of us are training to contests. But even after you words the problem does't seem to me as simple. Often such quick solutions depend on temporary weakeness of tests. svr Re: Where can I read about solving linear module equations?(+) // Задача 1458. Военные учения 11 янв 2009 11:29 Ac after some period! I did'n beleve that O-1 equation method can help. We have 10^6 unknowns and O(10^18) Gauss. But I had expierence for large systems with itteration method(as for Puasson eqution) and this method works here. But after I understood that the matrix of the system is nilpotent because nature of smoothing operator and itteration method has right foundation. Edited by author 10.02.2009 09:24 SPIRiT RE: program in one minute?(+) [2] // Задача 1458. Военные учения 28 сен 2007 13:48 Well, then, where is your AC for this problem? You have no AC's at all... Denis Koshman Re: RE: program in one minute?(+) [1] // Задача 1458. Военные учения 29 июл 2008 02:41 Just find a way to flip some cell without affecting others. It's easy for even N. Edited by author 03.08.2008 11:31 Fyodor Menshikov Re: RE: program in one minute?(+) // Задача 1458. Военные учения 10 фев 2009 01:00 Denis Koshman писал(a) 29 июля 2008 02:41 Just find a way to flip some cell without affecting others. Thanks! |