the solution is displayed as best pratices but DRY (LCM(x, y) is calculated twice)

Nice!!

Same bro

i see so i have to find a different approach thats quicker
got it tysm

When there is no next smaller number (the expected return value is -1), your solution has to check every number in your range. For the seventh sample test, that means it has to check 23456788 numbers before it returns -1. While this one sample case may be possible in under 12 seconds, you only have 12 seconds to complete all of the tests. When there is a possible next smaller number, your solution doesn't have to check nearly as many numbers, so it seems fast enough. You will have to come up with a more efficient solution. There is a method to figuring out the next smaller number, you don't have to try 10 million different numbers to find the correct one.

Excuse me! I want to delete the first my comment (but there is no such possibility on the site). I could not determine the algorithm for determining the secret word. And it was not possible for me to learn this algorithm. My opinion is that it would be easier if there were two tests in the task definition, simple and difficult (or medium).

Why not? How do you think this kata has been solved more than 17k times and nobody complained about that test?

As a simplification, you may assume that no letter occurs more than once in the secret string.

"mathisfun" has no repeated letters.

You can assume nothing about the triplets given to you other than that they are valid triplets and that they contain sufficient information to deduce the original string. In particular, this means that the secret string will never contain letters that do not occur in one of the triplets given to you.

With the input given you can recover "mathisfun". Seriously, I don't know what you meant there.

the test for 'whatisup' and the description of the problem condition are absolutely not suitable for the secret 'mathisfun'!!!

There is no such test, and mind your language.

Please read the description again, ['c','b','a'] is not a valid triplet for the string "abc":

A triplet here is defined as a sequence of three letters such that each letter occurs somewhere before the next in the given string. "whi" is a triplet for the string "whatisup".

try:
secret441 = "abc"
triplets441 = [
['c','b','a'],
['a','b','c']
]

Not bad)

From the description:

Also return -1 when the next smaller number with the same digits would require the leading digit to be zero.