Minimum Length of String After Operations

lcpy gen -n 3223   # by problem number
lcpy gen -s minimum_length_of_string_after_operations   # by problem name

Input: s = "abaacbcbb"
Output: 5
Explanation:
We do the following operations:

- Choose index 2, then remove the characters at indices 0 and 3. The resulting string is s = "bacbcbb".
- Choose index 3, then remove the characters at indices 0 and 5. The resulting string is s = "acbcb".

Input: s = "aa"
Output: 2
Explanation:
We cannot perform any operations, so we return the length of the original string.

from collections import Counter


class Solution:
    # Time: O(n)
    # Space: O(1)
    def minimum_length(self, s: str) -> int:
        return sum(c if c <= 2 else 1 if c % 2 else 2 for c in Counter(s).values())