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...
Filter AC, pass DC
give nth decimal place of pi
How many trades represent all the profit?
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