Make a square matrix with this shape. For n=4
1 1 0 0
1 0 1 0
0 1 0 1
0 0 1 1
Back to basics 19 - character types
Back to basics 20 - singleton dimensions
Back to basics 22 - Rotate a matrix
Determine Whether an array is empty
Altitude of locations on the earth
Derivative of polynomial
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