Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

Problem 2160. The 17x17 Problem

Created by Ned Gulley

This problem is sometimes referred to as the 17x17 challenge. See also Part 1 and Part 2 of this problem. This time, your job is to construct, for the given n, an n-by-n matrix in which there are no rectangles. A rectangle is a formed whenever four instances of the same value appear in the corners of a rectangular region of the matrix.

Examples:

 Input  n = 3
 Output a = [ 4 1 2
              1 4 3
              2 1 1 ]
 Input  n = 5
 Output a = [ 4 1 2 4 1
              3 3 2 1 4
              3 2 4 1 1
              1 4 3 2 2
              1 1 1 4 4 ]

The answer for a given n is not unique. The test suite will just guarantee that there are no rectangles present.

Note 1. I am using Alfonso's solution 191508 from problem 514 as my testing code. Cody in the service of Cody!

Note 2. You can easily answer this problem with a pre-computed response. You could do that, but it would be lame. We want to see your code!

Tags

Problem Group

Solution Statistics

5 correct solutions 18 incorrect solutions
Last solution submitted on Oct 04, 2014

Problem Comments

Solution Comments