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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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2020-04-18 17:19:46
There can be multiple answers, right? |
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2019-11-19 20:11:18
BIT On Point Nice Problem |
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2019-11-12 17:33:33
great BIT problem :) |
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2019-10-16 13:44:11
QUEUE AC in one go :) |
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2019-05-23 20:06:18
Great concept https://www.quora.com/How-can-I-solve-SPOJ-CTRICK-using-BIT-and-segment-tree Well explained here on how to solve using segment tree. Couldn't find how to fill and how to reduce complexity to nlogn earlier |
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2019-05-22 00:36:34
can anyone explain the test case how it varies in 4 and 5 |
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2019-04-07 07:04:45
cost me 2 days because of mod operator in the circle, Ac finally! |
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2017-12-12 09:59:18
i think this a very good problem if you use treap, then it will be easier to implement :) |
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2017-05-19 13:38:59
easy on paper,,implementation was slightly tough |
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2017-05-11 12:42:24
n=1 ans=1 got 1 WA for this..But undoubtedly one of the best problems on BIT..!! |