Count of unique Substrings
Count of distinct substrings
Count of substrings having unique chars is different

Distinct Substrings
Definition: Distinct substrings are all the substrings of a string, counted without regard to whether they contain repeated characters. Two substrings are considered distinct if they differ in at least one character or their position in the string.
Example: For the string "aba":
Substrings: "", "a", "b", "a", "ab", "ba", "aba"
Distinct Substrings: "", "a", "b", "ab", "ba", "aba"
Total distinct substrings: 6




Unique Substrings
Definition: Unique substrings are those that appear only once in the string. If a substring occurs multiple times, it is not counted as unique.
Example: For the string "aba":
Substrings: "", "a", "b", "a", "ab", "ba", "aba"
Unique Substrings: "", "b", "ab", "ba", "aba"
(The substring "a" is not unique because it appears twice.)
Total unique substrings: 5
Summary
Distinct Substrings: Count every unique instance of substrings, including those that appear multiple times.
Unique Substrings: Only count substrings that appear exactly once in the original string.
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