Return the 3n+1 sequence for n
Tic Tac Toe FTW
Sum of diagonal of a square matrix
Create a square matrix of zeros of even order
Find the Best Hotels
Vector of digits (★★)
Remove the row average (★★★)
Variance computation (★★★)
Generate n equally spaced "intervals" between -x and x (★)
Magnitude of a vector (★★★)
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