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Given an array (x) of integers, the "counting" array (y) is showing the number of identical consecutive integers in x in front of the integer itself. For example, if

- x = 1
- y = [1 1],

because there is one "1". If then

- x = [1 1]
- y = [2 1],

because there are now two "1"s. Finally, a more complex example:

- x = [1 2 2 4 4 3 0 0 1]
- y = [1 1 2 2 2 4 1 3 2 0 1 1].

So y gets two elements for each series of identical integers in x. (I hope this problem does not exist already)

41 correct solutions
21 incorrect solutions

Last solution submitted on Jun 20, 2015

2 players like this solution

1 Comment

Jean-Marie Sainthillier
on 14 Mar 2013

The best solution without regexprep.

2 Comments