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Ways to Split String

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Given a string S, we can split S into 2 strings: S1 and S2. Return the number of ways S can be split such that the number of unique characters between S1 and S2 are the same.

Example 1:

Input:  s = "aaaa"
Output: 3 
Explanation:
We can get a - aaa, aa - aa, aaa - a.

Example 2:

Input:  s = "bac"
Output: 0 
Explanation:
There are no ways to split the string such that the number of unique characters between S1 and S2 are the same.

Example 3:

Input:  s = "ababa"
Output: 2 
Explanation:
We can get ab - aba, aba - ba.

Constraints:

We dont know yet. If you happen to know aout it feel free to lmk. TYSM!