Let's define a function countUniqueChars(s) that returns the number of unique characters in s.
countUniqueChars(s) if s = "LEETCODE" then "L", "T", "C", "O", "D" are the unique characters since they appear only once in s, therefore countUniqueChars(s) = 5.Given a string s, return the sum of countUniqueChars(t) where t is a substring of s. The test cases are generated such that the answer fits in a 32-bit integer.
Notice that some substrings can be repeated so in this case you have to count the repeated ones too.
\n\n\n
Example 1:
\n\n\nInput: s = "ABC"\nOutput: 10\nExplanation: All possible substrings are: "A","B","C","AB","BC" and "ABC".\nEvery substring is composed with only unique letters.\nSum of lengths of all substring is 1 + 1 + 1 + 2 + 2 + 3 = 10\n\n\n
Example 2:
\n\n\nInput: s = "ABA"\nOutput: 8\nExplanation: The same as example 1, except countUniqueChars("ABA") = 1.\n\n\nExample 3:
\n\n\nInput: s = "LEETCODE"\nOutput: 92\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 105s consists of uppercase English letters only.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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