find the first elements of a column matrix
This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Determine whether a vector is monotonically increasing
Which doors are open?
2 b | ~ 2 b
03 - Matrix Variables 3
Flip the vector from right to left
Find remainder when x is divided by 3
Calculating selling price
modulus of a number
multiply an array by its position number
Find the last digit
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