Problem 672. Longest run of consecutive numbers

Created by James

Solve Later

Given a vector a, find the number(s) that is/are repeated consecutively most often. For example, if you have

a = [1 2 2 2 1 3 2 1 4 5 1]

The answer would be 2, because it shows up three consecutive times.

If your vector is a row vector, your output should be a row vector. If your input is a column vector, your output should be a column vector. You can assume there are no Inf or NaN in the input. Super (albeit non-scored) bonus points if you get a solution that works with these, though.

Solve

Solution Stats

1330 Solutions
200 Solvers

Last Solution submitted on Dec 15, 2019

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

Aurelien Queffurust on 21 Jun 2012

I don't understand why for test suite 4 :
a=[0 1 1 1 0 2 2 0 1 1 1 0];
y_correct = [1 1];
I expect y_correct = [1 1 1]

Tim on 21 Jun 2012

The idea seems to be to return the element that occurs in the longest run, or all such elements in case of a tie. In case 4 there are two longest runs, both with element 1.

Aurelien Queffurust on 22 Jun 2012

Thanks Tim for the explanation . So as the vector [1 1 1] appears twice in test 4 with the unique value 1 , the result must be twice the unqiue value -> [ 1 1]. ok ok thanks again

Solution Comments

Solution 2043151

1 Comment

1 Comment

Jack Shadow on 3 Dec 2019 at 1:22

It was not so easy...

Solution 1619892

2 Comments

2 Comments

David Motson on 19 Nov 2019 at 9:22

What kind of solution is that?

Gustavo Morales on 22 Nov 2019 at 4:52

that's a bug of Matlab Cody, the use of ! and regexp.
I don't know why Mathworks has it not corrected.

Problem Recent Solvers200

Problem Tags

consecutive repeating vectors

Problem 672. Longest run of consecutive numbers

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers200

Suggested Problems

More from this Author80

Problem Tags

Problem 672. Longest run of consecutive numbers

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers200

Suggested Problems

More from this Author80

Problem Tags

Players