So let's say that x is a vector, for example, x = [4, 4, 5, 5, 5, 6, 7, 7，8, 8, 8, 8]
Now we want to get the following two vectors, l = [2, 3, 1, 2, 4]; The number of repeats per element of x.
v = [4, 5, 6, 7, 8]; The value of repeating elements in x.
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In the definition of the problem, there are lots of 8. You should revise it.
Thanks for your advice, it has been changed.