Problem 1678. Count consecutive 0's in between values of 1

Created by Chris E.

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Last Solution submitted on Mar 27, 2023

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shahriar memaran on 23 Mar 2017

My opinion is that the answers for this problem are wrong. The problem is asking for counting zeros between values 1. So for example for Input = [0 1 0 0 0 1 0 1 1 1 0 0 0 1 0 1 1 0 0] the correct Output is [3 1 0 0 3 1 0] and not [1 3 1 0 0 3 1 0 2]. Reasoning that there is no 1 at the beginning and at the end of the vector and so the beginning and end zeros should not be counted.

yurenchu on 15 Apr 2017

How about adding a test case in which vector x starts with a 1, such as x = [1 0 0 1 0] ? (Several of the submitted/approved solutions would give the answer as y = [0 2 1] instead of y = [2 1] . )

Ankit Singh on 23 Mar 2022

The starting or the trailing zeros in the array shouldn't be counted.

Christian Schröder on 6 Oct 2022

I think your first test case is wrong: when x = [1], then there are no pairs of consecutive ones, and the proper answer is y = [] rather than y = [0]. In contrast, y = [0] is correct when x = [1 1], where there are two ones that have no zeros in between.

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Solution 2943265

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Jimmy Sølvsteen Nielsen on 13 Sep 2020

I would suggest adding the base case x=[]; y=[] (or 0 depending on definition of the problem

Solution 268568

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J.R.! Menzinger on 27 Jun 2013

I was looking for this solution:
http://www.mathworks.de/matlabcentral/cody/problems/1678-count-consecutive-0-s-in-between-values-of-1/solutions/267945
but I was not precise enough with the regexp... ;-)

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Problem 1678. Count consecutive 0's in between values of 1

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Problem 1678. Count consecutive 0's in between values of 1

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