Please try to solve a harder version "Problem 44448. Project Euler: Problem 14 Longest Collatz sequence"
Find common elements in matrix rows
Angle between two vectors
Flip the main diagonal of a matrix
Cell Counting: How Many Draws?
Find my secret number
Divisors for big integer
Numbers spiral diagonals (Part 1)
Clear all empty variables from the workspace
Negation and new variables
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