Given two strings a and b, return the length of the longest uncommon subsequence between a and b. If the longest uncommon subsequence does not exist, return -1.
An uncommon subsequence between two strings is a string that is a subsequence of one but not the other.
\n\nA subsequence of a string s is a string that can be obtained after deleting any number of characters from s.
"abc" is a subsequence of "aebdc" because you can delete the underlined characters in "aebdc" to get "abc". Other subsequences of "aebdc" include "aebdc", "aeb", and "" (empty string).\n
Example 1:
\n\n\nInput: a = "aba", b = "cdc"\nOutput: 3\nExplanation: One longest uncommon subsequence is "aba" because "aba" is a subsequence of "aba" but not "cdc".\nNote that "cdc" is also a longest uncommon subsequence.\n\n\n
Example 2:
\n\n\nInput: a = "aaa", b = "bbb"\nOutput: 3\nExplanation: The longest uncommon subsequences are "aaa" and "bbb".\n\n\n
Example 3:
\n\n\nInput: a = "aaa", b = "aaa"\nOutput: -1\nExplanation: Every subsequence of string a is also a subsequence of string b. Similarly, every subsequence of string b is also a subsequence of string a.\n\n\n
\n
Constraints:
\n\n1 <= a.length, b.length <= 100a and b consist of lower-case English letters.Compiled with clang 11 using the latest C++ 20 standard.
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