You are given a string s consisting only of the characters 'a' and 'b'.
You are allowed to repeatedly remove any substring where the number of 'a' characters is equal to the number of 'b' characters. After each removal, the remaining parts of the string are concatenated together without gaps.
Return an integer denoting the minimum possible length of the string after performing any number of such operations.
\n\n\n
Example 1:
\n\nInput: s = "aabbab"
Output: 0
\n\nExplanation:
\n\nThe substring "aabbab" has three 'a' and three 'b'. Since their counts are equal, we can remove the entire string directly. The minimum length is 0.
Example 2:
\n\nInput: s = "aaaa"
Output: 4
\n\nExplanation:
\n\nEvery substring of "aaaa" contains only 'a' characters. No substring can be removed as a result, so the minimum length remains 4.
Example 3:
\n\nInput: s = "aaabb"
Output: 1
\n\nExplanation:
\n\nFirst, remove the substring "ab", leaving "aab". Next, remove the new substring "ab", leaving "a". No further removals are possible, so the minimum length is 1.
\n
Constraints:
\n\n1 <= s.length <= 105s[i] is either 'a' or 'b'.给你一个仅由字符 'a' 和 'b' 组成的字符串 s。
你可以反复移除 任意子字符串 ，只要该子字符串中 'a' 和 'b' 的数量相等。每次移除后，剩余部分的字符串将无缝拼接在一起。
返回一个整数，表示经过任意次数的操作后，字符串可能的 最小长度 。
\n\n子字符串 是字符串中一个连续、非空的字符序列。
\n\n\n\n
示例 1：
\n\n输入： s = \"aabbab\"
输出： 0
\n\n解释：
\n\n子字符串 \"aabbab\" 中有三个 'a' 和三个 'b'。由于它们的数量相等，可以直接移除整个字符串，最小长度为 0。
示例 2：
\n\n输入： s = \"aaaa\"
输出： 4
\n\n解释：
\n\n字符串 \"aaaa\" 中每个子字符串都仅包含 'a'，无法移除任何部分，因此最小长度仍为 4。
示例 3：
\n\n输入： s = \"aaabb\"
输出： 1
\n\n解释：
\n\n首先移除子字符串 \"ab\"，剩下 \"aab\"。然后再移除新的子字符串 \"ab\"，剩下 \"a\"。无法再移除任何部分，因此最小长度为 1。
\n\n
提示：
\n\n1 <= s.length <= 105s[i] 是 'a' 或 'b'。count_a and the count of b's be count_b. Can we derive the final length from these?",
"The answer is abs(count_a - count_b)"
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