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Codeforces (c) Copyright 2010-2024 Михаил Мирзаянов
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I am the author of problem C, and I have to admit, I have never known of any of those links above, and none of my friends told me about those either :D
P/s: And yes, might be subjective, but I'd rather implementing this one than Googling :D
That's funny because you can just google the whole phrase from the statement: "the number of trailing zero digits in the b-ary (in the base/radix of b) representation of n! (factorial of n)."
also https://cp-algorithms.com/algebra/factorial-divisors.html :)
and russian http://e-maxx.ru/algo/factorial_divisors
Hi so to me seems like a notorious coincidence