|
|
Show all threads Hide all threads Show all messages Hide all messages | Page 1 | Idea | ilyamit | 1480. Coupons | 18 Nov 2009 16:02 | 6 | Idea ilyamit 5 Nov 2007 15:38 What is idea for this priblem? I fill matrix for chess: n = 4 0101 1010 0101 1010 0 - smoll number 1 - big number Why my solve is wrong?((( I got WA4. Re: Idea Loky_Yuri [USTU Frogs] 6 Nov 2007 10:54 During the contest our team didn't solve this problem because of the same logic. Now I understand that the same idea but with putting the biggest number in the conner is so simple... Re: Idea AlexF [USTU Frogs] 6 Nov 2007 10:59 Thanks! I got AC. Is true idea (for 4): 1 0 1 0 0 1 0 1 1 0 1 0 0 1 0 1 Edited by author 27.11.2007 15:37 Edited by author 27.11.2007 15:38 Re: Idea Roman Peshkurov (It-Team) 18 Nov 2009 16:02 i am using BFS with queue | How to solve this problem? | Aram Shatakhtsyan | 1480. Coupons | 5 Aug 2010 02:32 | 3 | Someone who solved this problem, give some ideas, please. The answer is n^2 + floor(n/2) + 1. Place n^2 in top-left corner and proceed row-by-row, column-by-column. For every cell choose maximal unused value, such that its sum with left and upper numbers is <= that minimal sum. I have no idea why that works. The formula above was found empirically - these are minimal values when this greedy algorithm converges. Edited by author 24.07.2008 15:00 Real cheat! With this formula the problem is VERY easy! IMHO, without it - it would take much more time and efforts to get AC. | I have WA#2. Please, help me. | Tkach Andriy | 1480. Coupons | 18 Mar 2007 22:37 | 2 | I think that matrix have some stucture but I don't now this. It is so easy try only with yourself it's always better :) | How to prove? | SpaceFlyer | 1480. Coupons | 11 Oct 2006 06:10 | 1 | |
Pages: 1 |
|
|