Given a string s consisting only of characters 'a', 'b', and 'c'. You are asked to apply the following algorithm on the string any number of times:
s where all the characters in the prefix are equal.s where all the characters in this suffix are equal.Return the minimum length of s after performing the above operation any number of times (possibly zero times).
\n
Example 1:
\n\n\nInput: s = "ca"\nOutput: 2\nExplanation: You can't remove any characters, so the string stays as is.\n\n\n
Example 2:
\n\n\nInput: s = "cabaabac"\nOutput: 0\nExplanation: An optimal sequence of operations is:\n- Take prefix = "c" and suffix = "c" and remove them, s = "abaaba".\n- Take prefix = "a" and suffix = "a" and remove them, s = "baab".\n- Take prefix = "b" and suffix = "b" and remove them, s = "aa".\n- Take prefix = "a" and suffix = "a" and remove them, s = "".\n\n
Example 3:
\n\n\nInput: s = "aabccabba"\nOutput: 3\nExplanation: An optimal sequence of operations is:\n- Take prefix = "aa" and suffix = "a" and remove them, s = "bccabb".\n- Take prefix = "b" and suffix = "bb" and remove them, s = "cca".\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 105s only consists of characters 'a', 'b', and 'c'.给你一个只包含字符 'a'，'b' 和 'c' 的字符串 s ，你可以执行下面这个操作（5 个步骤）任意次：
s 一个 非空 的前缀，这个前缀的所有字符都相同。s 一个 非空 的后缀，这个后缀的所有字符都相同。请你返回对字符串 s 执行上面操作任意次以后（可能 0 次），能得到的 最短长度 。
\n\n
示例 1：
\n\n\n输入：s = \"ca\"\n输出：2\n解释：你没法删除任何一个字符，所以字符串长度仍然保持不变。\n\n\n
示例 2：
\n\n\n输入：s = \"cabaabac\"\n输出：0\n解释：最优操作序列为：\n- 选择前缀 \"c\" 和后缀 \"c\" 并删除它们，得到 s = \"abaaba\" 。\n- 选择前缀 \"a\" 和后缀 \"a\" 并删除它们，得到 s = \"baab\" 。\n- 选择前缀 \"b\" 和后缀 \"b\" 并删除它们，得到 s = \"aa\" 。\n- 选择前缀 \"a\" 和后缀 \"a\" 并删除它们，得到 s = \"\" 。\n\n
示例 3：
\n\n\n输入：s = \"aabccabba\"\n输出：3\n解释：最优操作序列为：\n- 选择前缀 \"aa\" 和后缀 \"a\" 并删除它们，得到 s = \"bccabb\" 。\n- 选择前缀 \"b\" 和后缀 \"bb\" 并删除它们，得到 s = \"cca\" 。\n\n\n
\n\n
提示：
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