Problem 2225. Three...is a magic number.

Created by James

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Yes it is...</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>It's a magic number...</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>To help you get rid of that earworm, here's a new Cody problem. You are given a square matrix containing positive integers. We want to determine if there are three consecutive occurrences of the same number in a row or column. For example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ 1 1 1\n 4 2 3\n 2 3 4]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Should be marked \"true\" because there are three consecutive ones in the first row. Likewise</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ 5 2 3\n 5 3 2\n 5 4 1]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>should also be marked \"true\" because there are three consecutive fives in the first column. However:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ 5 2 3\n 3 5 2\n 1 4 5]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Is false, as we do not care about the three consecutive fives along the trace of the matrix. The matrix will always be at least 3x3, but they can be larger. Good luck!</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

187 Solutions
55 Solvers

Last Solution submitted on Nov 18, 2020

Last 200 Solutions

Problem Comments

Solution Comments

Solution 430049

1 Comment

1 Comment

Jan Orwat on 10 Apr 2014

This should not work in general. It returns false-positive for consecutive 1 5 7 :-)

Solution 412943

2 Comments

2 Comments

Tim on 3 Mar 2014

This should not work, but test suite only requires us to check for groups of three in columns.

James on 6 Mar 2014

Thanks for noticing that...I'll edit the test suite and fix that.

Problem Recent Solvers55

Problem Tags

match three matrix schoolhouse rock

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 2225. Three...is a magic number.

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers55

Suggested Problems

More from this Author80

Problem Tags

Community Treasure Hunt

Problem 2225. Three...is a magic number.

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers55

Suggested Problems

More from this Author80

Problem Tags

Community Treasure Hunt

Players