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.
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] . )
I would suggest adding the base case x=; y= (or 0 depending on definition of the problem
I was looking for this solution:
but I was not precise enough with the regexp... ;-)
Project Euler: Problem 7, Nth prime
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