In Python, are my two very different algorithms too slow or could it be related to the generation of long random test cases ? Is there a way to time each ?

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I either time out but my logic is correct (checked out of CW) or I follow the hint to use s = (s % (M+1) + math.floor(s/(M+1))) % M and get an error:
OverflowError: integer division result too large for a float

Should we go bitwise arithmetic to solve this ? If so, not sure it is a 6kyu.

I spent 10 hours+ figuring out a mathematical solution based on triangular numbers and the hint that a solution existed without iteration. Keep trying. I'm probably dumber ;-)

Python Test results are strange: [1,2,3,4,5,6,7 ] Expected result = 0 ?

Very hard kata.

pure math problem. don t code anything !

You need to go through all sequences of 5 digits in the string and find the maximun. In a 2 digit example 3289658, you check 32, 28, 89, 96 ,65, 58 and so on and your max is 32 then 89 then 96 ... so max = 96

Tests in Python are inconsistent. Sometime the last space is kept, but not the next one. Waste of time.

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Random length of tests make it more difficult than 6 kyus. I don't know of two digits bank number or 200 long ones.
A 20 long bank number is not a bank number, it is a random string.

Random number of white spaces makes it more difficult than 7 kyu for newbies, imho.

How do you raise an exception with a simple error message in Python3. I tried raise Exception('message') but it doesn't work. Not your usual 8 kyu in Python, if i may comment.