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GNY07H - Tiling a Grid With Dominoes |
We wish to tile a grid 4 units high and N units long with rectangles (dominoes) 2 units by one unit (in either orientation). For example, the figure shows the five different ways that a grid 4 units high and 2 units wide may be tiled.
Write a program that takes as input the width, W, of the grid and outputs the number of different ways to tile a 4-by-W grid.
Input
The first line of input contains a single integer N, (1 ≤ N ≤ 1000) which is the number of datasets that follow.
Each dataset contains a single decimal integer, the width, W, of the grid for this problem instance.
Output
For each problem instance, there is one line of output: The problem instance number as a decimal integer (start counting at one), a single space and the number of tilings of a 4-by-W grid. The values of W will be chosen so the count will fit in a 32-bit integer.
Example
Input: 3 2 3 7 Output: 1 5 2 11 3 781
Added by: | Marco Gallotta |
Date: | 2008-03-12 |
Time limit: | 9.600s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ERL JS-RHINO NODEJS PERL6 VB.NET |
Resource: | ACM Greater New York Regionals 2007 |
hide comments
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2015-12-30 13:51:57 quirk
For those who need the image: http://imgur.com/nhxjwNe |
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2015-07-09 21:59:36 xxbloodysantaxx
No Image found ! Link broken |
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2015-03-15 06:58:15 Rishabh Joshi
Very nice problem!! Learnt a lot! (hint: how can you start the series? Write all combinations of dominos by which you can start(and continue), and the answer will start to present itself)! |
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2015-02-13 08:45:32 Govind Lahoti
Awesome problem. Enjoyed solving it :) |
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2014-12-18 11:21:07 mayank
Tried after M3TILE. Almost similar. Could not get it straight though! :P |
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2014-07-01 19:25:33 fanatique
good one :) |
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2014-06-24 21:34:24 Ravi Shankar Mondal
100th green light :) |
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2014-05-26 17:18:19 Noob
Good one! |
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2014-01-30 06:33:30 Himanshu
Shouldn't input 3 give 5 + 2*5 - 1 = 14 as each tiling (except last) for input 2 can be widened by adding a column to the left or to the right. |
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2013-12-30 07:51:38 Ankit Kumar
my 50th on SPOJ :) |