The common factor must be an integer too, or else there is no way to find it without more parameters; defining the step and search interval for instance. Currently, any multiple of 5 would produce a valid "restored vector" for the only available test. The problem also needs a better test suite. It's a good problem.
Doesn't always work, for example when x = 11*[ 5, 7, 32] .
Oops. C itself doesn't have to be an integer. Should have checked the test suite more carefully...
Most nonzero elements in row
Twins in a Window
Back to basics 22 - Rotate a matrix
07 - Common functions and indexing 2
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