Given a string s, return the maximum number of unique substrings that the given string can be split into.
You can split string s into any list of non-empty substrings, where the concatenation of the substrings forms the original string. However, you must split the substrings such that all of them are unique.
A substring is a contiguous sequence of characters within a string.
\n\n\n
Example 1:
\n\n\nInput: s = "ababccc"\nOutput: 5\nExplanation: One way to split maximally is ['a', 'b', 'ab', 'c', 'cc']. Splitting like ['a', 'b', 'a', 'b', 'c', 'cc'] is not valid as you have 'a' and 'b' multiple times.\n\n\n
Example 2:
\n\n\nInput: s = "aba"\nOutput: 2\nExplanation: One way to split maximally is ['a', 'ba'].\n\n\n
Example 3:
\n\n\nInput: s = "aa"\nOutput: 1\nExplanation: It is impossible to split the string any further.\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 16
s contains only lower case English letters.
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