#3816
Lexicographically Smallest String After Deleting Duplicate Characters
grandmaster · 2220 · lc hard +32 · 19.4% accepted · 41 likes · top 1%
Description
Given a string s of lowercase English letters, repeatedly pick any character that still has a duplicate in s and remove one copy of it (you may do this any number of times, including zero). Return the lexicographically smallest string achievable.
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