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

Created by Chris E.

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So you have some vector that contains 1's and 0's, and the goal is to return a vector that gives the number of 0's between each one. for example:

Input = [0 1 0 0 0 1 0 1 1 1 0 0 0 1 0 1 1 0 0]

Output = [1 3 1 0 0 3 1 0 2]

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Last Solution submitted on Oct 24, 2025

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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.

George on 14 May 2024

I think you should revise your test cases.
The question is to find the number of zeroes between consecutive ones. Leading and trailing zeroes in x should not count.
E.g.
x=[1] -> y=[]
x=[0] -> y=[]
x=[0 1] -> y=[]
x =[1 0] -> y=[]
x = [0 1 0] -> y=[]
but
x = [1 1] -> y=[0]
x = [1 1 1] -> y=[0 0]
x = [1 0 1] -> y=[1]
etc.

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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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