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3223. Minimum Length of String After Operations 👍

  • Time: $O(n)$
  • Space: $O(26) = O(1)$
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class Solution {
 public:
  int minimumLength(string s) {
    int ans = 0;
    vector<int> count(26);

    for (const char c : s)
      ++count[c - 'a'];

    for (int i = 0; i < 26; ++i)
      if (count[i] > 0)
        ans += count[i] % 2 == 0 ? 2 : 1;

    return ans;
  }
};

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class Solution {
  public int minimumLength(String s) {
    int ans = 0;
    int[] count = new int[26];

    for (final char c : s.toCharArray())
      ++count[c - 'a'];

    for (int i = 0; i < 26; ++i)
      if (count[i] > 0)
        ans += count[i] % 2 == 0 ? 2 : 1;

    return ans;
  }
}

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class Solution:
  def minimumLength(self, s: str) -> int:
    count = collections.Counter(s)
    return sum(2 if freq % 2 == 0 else 1 for freq in count.values())