Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
Reverse Run-Length Encoder
Angle between two vectors
Convert a vector into a number
Matrix with different incremental runs
subtract central cross
Find my secret number
Mysterious digits operation (easy)
Return a list sorted by number of consecutive occurrences
Pandigital number n°1 (Inspired by Project Euler 32)
Mirror, mirror on the wall, who is fairest of them all?
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