6 kyu
Longest Alternating Substring
144saudiGuy
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Algorithms
Logic
Regular Expressions
Strings
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i really like this guy's katas, very educative
great kata!
i recommend adding the performance tag in the description
How do you explain this:
longest_substring("70") ➞ "7"
I think the author mess it up in the description only. In the tests, it's actually "20".
I fixed the description. BTW, kata is approvable at 6, 5 or 4 kyu, though for me it's clearly not harder than 7 kyu... I can't remember where we can see all the ranking votes.
You can see the rank votes here: https://www.codewars.com/api/v1/code-challenges/64db008b529cad38938c6e28/assessed-ranks
Also, you forgot to change the input string as well (it's still "70" in the desc).
@Mednoob, corrected description now.