perplexus.info :: Algorithms : Rotating an array

Rotating an array (Posted on 2004-04-19)

I have an array such as A-B-C-D-E-F-G-H-I-J-K I want to rotate it N places to the right; for example, if N=3, the array should end I-J-K-A-B-C-D-E-F-G-H

Assume that the only available operation is a FLIP method that can invert any portion of the array. For example, applied to the original array FLIP(3,6) would produce A-B-F-E-D-C-G-H-I-J-K.

Submitted by e.g.

Rating: 4.0000 (13 votes)

Solution: (Hide)

Call the array length L. First FLIP(1,L-N):
H G F E D C B A I J K
Then FLIP(L-N+1,N):
H G F E D C B A K J I
Finally, FLIP(1,N), and you are done.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Rotating an array the function FLIP()	Prashant	2007-06-12 03:39:43
No Subject	sundaram	2006-12-03 08:04:28
re: SOLUTION	Amitava	2004-05-21 22:51:26
SOLUTION	Amitava	2004-05-21 22:18:57
re(2): Here is a program that compares the algorithms	Penny	2004-04-24 03:29:12
re(2): 10 step method	logischer Verstand	2004-04-23 22:13:06
re: Here is a program that compares the algorithms	Juggler	2004-04-20 19:19:11
a solution	Saka	2004-04-20 13:06:54
Here is a program that compares the algorithms	Penny	2004-04-20 13:04:39
re: 10 step method	Federico Kereki	2004-04-20 12:38:19
re: A possible way	Federico Kereki	2004-04-20 08:03:01
re: 10 step method	Charlie	2004-04-19 23:24:52
A better way, from the beginning	Oskar	2004-04-19 20:56:04
re: 3 Step Method	SilverKnight	2004-04-19 20:30:22
Revised Algorithm	Penny	2004-04-19 19:09:54
3 Step Method	Juggler	2004-04-19 18:40:49
re(2): 10 step method	logischer Verstand	2004-04-19 18:17:45
re: 10 step method	SilverKnight	2004-04-19 18:02:43
re: Algorithm	SilverKnight	2004-04-19 18:00:09
re(2): question for e.g.	logischer Verstand	2004-04-19 17:58:58
10 step method	logischer Verstand	2004-04-19 17:58:17
Algorithm	Penny	2004-04-19 17:52:44
A possible way	Oskar	2004-04-19 17:51:17
re: question for e.g.	SilverKnight	2004-04-19 17:49:00
question for e.g.	logischer Verstand	2004-04-19 17:39:36
one way	Larry	2004-04-19 16:47:15

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