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 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.

 See The Solution Submitted by e.g. Rating: 4.0000 (13 votes)

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 10 step method | Comment 6 of 26 |

Start:
A-B-C-D-E-F-G-H-I-J-K

1.    FLIP(1,9)=I-B-C-D-E-F-G-H-A-J-K

2.    FLIP(2,10)=I-J-B-C-D-E-F-G-H-A-B-K

3.    FLIP(3,11)=I-J-K-D-E-F-G-H-A-B-C

4.    FLIP(8,11)=I-J-K-D-E-F-G-C-A-B-H

5.    FLIP(7,10)=I-J-K-D-E-F-B-C-A-G-H

6.    FLIP(6,9)=I-J-K-D-E-A-B-C-F-G-H

7.    FLIP(5,8)=I-J-K-D-C-A-B-E-F-G-H

8.    FLIP(4,7)=I-J-K-B-C-A-D-E-F-G-H

9.    FLIP(4,6)=I-J-K-A-C-B-D-E-F-G-H

10.    FLIP(5,6)=I-J-K-A-B-C-D-E-F-G-H

I am working on trying to possibly reduce it by one or two more steps

Edited on April 19, 2004, 6:15 pm
 Posted by logischer Verstand on 2004-04-19 17:58:17

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