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2716. Minimize String Length

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  int minimizedStringLength(string s) {
    return unordered_set(s.begin(), s.end()).size();
  }
};

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class Solution {
  public int minimizedStringLength(String s) {
    return new HashSet<>(Arrays.asList(s.split(""))).size();
  }
}

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class Solution:
  def minimizedStringLength(self, s: str) -> int:
    return len({*s})