Input a Matrix x, Output y is the matrix rotating x 90 degrees clockwise
why i cannot use seqreverse here?
You should make more test suites, currently you can just set y to the one correct result.
Find best placement for ordered dominoes (harder)
middleAsColumn: Return all but first and last element as a column vector
Get the length of a given vector
Deleting an element in a matrix
Determine Whether an array is empty
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