I want to say that the description is a little bit of confused.
For example, [1,2,3,4,5]
the answer is 6: [1,2,3][2,3,4][3,4,5][1,2,3,4][2,3,4,5][1,2,3,4,5]
What about the [1,3,5] ?
Do we allow to construct the array this way?
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