Problem 520. Choose the best fitting dominoes

Created by Doug Hull

Solve Later

You will be given a cell array of nx2 matrices. Choose one row from each matrix. These are the ordered pairs that will be placed in a line like this.

{[1 2  [4 5 [0 4
  3 5   2 4  3 2
  1 5]  5 1] 5 3]}

Choices might be: [1 2 3]

yields: [1 2][2 4][5 3]
    or: abs(2-2) + abs(4-5)
    or:        0 + 1
    or: 1

You are trying to minimize the score, the absolute difference of the sum of the difference at the intersections.

Solve

Solution Stats

515 Solutions
161 Solvers

Last Solution submitted on Nov 22, 2019

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

@bmtran (Bryant Tran) on 4 Apr 2012

this isn't a big deal, but you have inconsistent inputs for your test cases. cases 1 & 3 are 'row vector' cell arrays whereas case 2 is a 'column vector' cell array.

David Verrelli on 9 Jun 2018

It would be good to amend the Test Suite in the following regards: (1) Add "%%" to the beginning of the first test case, so that Cody interprets it as intended. (2) Include more test cases: currently the twelve smallest 'correct' submissions are all hard-coded cheats. (3) Include test cases in which the minimum score is not zero. (4) Include test cases in which the number of dominoes to be placed "in a line" is not three. —DIV

David Verrelli on 9 Jun 2018

And (5) Include test cases in which for a particular position there are more than 9 candidate dominoes available.

Solution Comments

Solution 1554381

1 Comment

1 Comment

David Verrelli on 8 Jun 2018

Cf. Solution 1554377: if Shared Variables ("SV") assertion fails, output from SV section is echoed to console and Test Point is not called. If SV assertion is passed, output from SV section is not echoed to console (i.e. 'hidden'), and Test Point is called, with output from the Test Point call echoed to console.

Solution 1552741

1 Comment

1 Comment

David Verrelli on 7 Jun 2018

Defect in Test Suite.

Solution 1474776

1 Comment

1 Comment

David Verrelli on 9 Jun 2018

Presumably would fail if the Test Suite contained a case in which there were more than 9 candidate dominoes available for a particular position.

Solution 882213

1 Comment

1 Comment

David Verrelli on 9 Jun 2018

Nice.

Solution 786532

1 Comment

1 Comment

vahid simintan on 1 Dec 2015

this code works well in my desktop matlab, but is incorrect here,why?

Solution 600694

2 Comments

2 Comments

Daniel Pereira on 23 Mar 2015

Some cheating :), since the least score is always 0 in the test suite, despite the statement in the problem description.

David Verrelli on 9 Jun 2018

Honesty always appreciated :-) This is also an example of relying on the Test Suite always requiring 3 dominoes to be represented in the output (i, j & k here). —DIV

Problem Recent Solvers161

Problem Tags

contest poor_test_suite

Problem 520. Choose the best fitting dominoes

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers161

Suggested Problems

More from this Author52

Problem Tags

Problem 520. Choose the best fitting dominoes

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers161

Suggested Problems

More from this Author52

Problem Tags

Players