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CTRICK - Card Trick |
The magician shuffles a small pack of cards, holds it face down and performs the following procedure:
- The top card is moved to the bottom of the pack. The new top card is dealt face up onto the table. It is the Ace of Spades.
- Two cards are moved one at a time from the top to the bottom. The next card is dealt face up onto the table. It is the Two of Spades.
- Three cards are moved one at a time…
- This goes on until the nth and last card turns out to be the n of Spades.
This impressive trick works if the magician knows how to arrange the cards beforehand (and knows how to give a false shuffle). Your program has to determine the initial order of the cards for a given number of cards, 1 ≤ n ≤ 20000.
Input
On the first line of the input is a single positive integer, telling the number of test cases to follow. Each case consists of one line containing the integer n.
Output
For each test case, output a line with the correct permutation of the values 1 to n, space separated. The first number showing the top card of the pack, etc…
Example
Input: 2 4 5 Output: 2 1 4 3 3 1 4 5 2
Added by: | Camilo Andrés Varela León |
Date: | 2006-11-23 |
Time limit: | 3.279s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ERL JS-RHINO NODEJS PERL6 VB.NET |
Resource: | Nordic Collegiate Contest 2006 |
hide comments
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2016-08-01 21:46:31
Am i only who didn't understand whats happening actually. -_- |
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2016-06-29 13:17:05
Did using queue in o(n^2) time AC |
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2016-05-27 14:19:51
AC in 0.45 by n^2 logic! |
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2016-05-22 08:32:27 Kshitij Korde
If c++ list is used, use splice function for speeding up. (Removing first n element and appending it at the end). Iteration times out. |
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2016-03-22 03:58:39 hardik agrawal
wonder how!! but got AC in 1.74 using n^2 solution.. |
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2016-01-25 11:10:50 GAURAV CHANDEL
You Beauty -- BIT... |
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2015-10-08 10:14:52 A@$H!K
My first proper BIT! :D |
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2015-08-30 15:57:22
0.98s with a cyclic list. FAIL |
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2015-07-23 10:22:51 sHaShAnK sHeKhAr
How can we prove that such configuration of cards will always exist for all values of n?? |
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2015-07-10 09:15:31
Last edit: 2016-07-31 16:21:52 |