Similar to, though simpler than, James's decimation problem: https://www.mathworks.com/matlabcentral/cody/problems/1092-decimation.
Who Has the Most Change?
Sums with Excluded Digits
Rotate a Matrix by 90 degrees
The Answer to Life, the Universe, and Everything
Given a matrix, swap the 2nd & 3rd columns
Which way to go?
How many rectangles in a grid ?
Slicing the cube
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