Problem 875. Return a list sorted by number of consecutive occurrences

Created by Jean-Marie Sainthillier

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Inspired by Problem 38 by Cody Team. Given a vector x, return a vector y of the values in x sorted by the number of CONSECUTIVE occurrences in x. Ties (and it is the difficulty) are sorted from lowest to highest. So if x = [1 2 2 2 3 3 7 7 93] then

 y = [2 3 7 1 93]

But if x = [1 1 2 2 2 3 3 7 7 1 93] then

 y = [2 1 3 7 1 93]

Solve

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408 Solutions
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Last Solution submitted on Mar 18, 2020

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4 Comments

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Jean-Marie Sainthillier on 13 Aug 2012

@bmtran is a too strong for me.

J.R.! Menzinger on 21 Feb 2014

I think that in case 3, the correct answer should be: y_correct1 = [1 0 2 9 1 -5 2 0 11] and in case 4: y_correct0 = [1 0 1 0], or did I misunderstood the goal?

Berkay Dogus on 1 Aug 2018

I agree with J.R.! Menzinger. Correct answers given are wrong.

goc3 on 2 Aug 2018

No, the provided answers in the test cases are correct. This is "the difficulty" that Jean-Marie mentions above: for integers that are tied by number of occurrences, they are to be sorted within the tied subset in ascending order, not kept in the original ordering within the vector.

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indexing vectors

Problem 875. Return a list sorted by number of consecutive occurrences

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Last 200 Solutions

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Problem Recent Solvers118

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Problem 875. Return a list sorted by number of consecutive occurrences

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Last 200 Solutions

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Problem Recent Solvers118

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