main.py

class Solution(object):
    def minimumLength(self, s):
        """
        :type s: str
        :rtype: int
        """
        # Step 1: Count the frequency of each character in the string
        char_frequency_map = Counter(s)

        # Step 2: Calculate the number of characters to delete
        delete_count = 0
        for frequency in char_frequency_map.values():
            if frequency % 2 == 1:
                # If frequency is odd, delete all except one
                delete_count += frequency - 1
            else:
                # If frequency is even, delete all except two
                delete_count += frequency - 2

        # Step 3: Return the minimum length after deletions
        return len(s) - delete_count