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2021-02-23: given a positive number n, the number of split method o n. : behind the number cannot be
The 2021-02-23: given a positive number n, the number of split method o n, regulation: the number cannot be smaller than the number in front of, behind such as 4 split method has: 1 + 1 + 1 + 2 + 1 + 1, 1, 1 + 2 + 3, 2, four, five, so return to 5,
