Given a string s, partition the string into one or more substrings such that the characters in each substring are unique. That is, no letter appears in a single substring more than once.
Return the minimum number of substrings in such a partition.
\n\nNote that each character should belong to exactly one substring in a partition.
\n\n\n
Example 1:
\n\n\nInput: s = "abacaba"\nOutput: 4\nExplanation:\nTwo possible partitions are ("a","ba","cab","a") and ("ab","a","ca","ba").\nIt can be shown that 4 is the minimum number of substrings needed.\n\n\nExample 2:
\n\n\nInput: s = "ssssss"\nOutput: 6\nExplanation:\nThe only valid partition is ("s","s","s","s","s","s").\n\n\n\n
Constraints:
\n\n1 <= s.length <= 105s consists of only English lowercase letters.Compiled with clang 11 using the latest C++ 17 standard.
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