You are given a string array words and a binary array groups both of length n.
A subsequence of words is alternating if for any two consecutive strings in the sequence, their corresponding elements at the same indices in groups are different (that is, there cannot be consecutive 0 or 1).
Your task is to select the longest alternating subsequence from words.
Return the selected subsequence. If there are multiple answers, return any of them.
\n\nNote: The elements in words are distinct.
\n
Example 1:
\n\nInput: words = ["e","a","b"], groups = [0,0,1]
\n\nOutput: ["e","b"]
\n\nExplanation: A subsequence that can be selected is ["e","b"] because groups[0] != groups[2]. Another subsequence that can be selected is ["a","b"] because groups[1] != groups[2]. It can be demonstrated that the length of the longest subsequence of indices that satisfies the condition is 2.
Example 2:
\n\nInput: words = ["a","b","c","d"], groups = [1,0,1,1]
\n\nOutput: ["a","b","c"]
\n\nExplanation: A subsequence that can be selected is ["a","b","c"] because groups[0] != groups[1] and groups[1] != groups[2]. Another subsequence that can be selected is ["a","b","d"] because groups[0] != groups[1] and groups[1] != groups[3]. It can be shown that the length of the longest subsequence of indices that satisfies the condition is 3.
\n
Constraints:
\n\n1 <= n == words.length == groups.length <= 1001 <= words[i].length <= 10groups[i] is either 0 or 1.words consists of distinct strings.words[i] consists of lowercase English letters.给定一个字符串数组 words ，和一个 二进制 数组 groups ，两个数组长度都是 n 。
如果 words 的一个 子序列 是交替的，那么对于序列中的任意两个连续字符串，它们在 groups 中相同索引的对应元素是 不同 的（也就是说，不能有连续的 0 或 1），
你需要从 words 中选出 最长交替子序列。
返回选出的子序列。如果有多个答案，返回 任意 一个。
\n\n注意：words 中的元素是不同的 。
\n\n
示例 1：
\n\n\n输入：words = [\"e\",\"a\",\"b\"], groups = [0,0,1]\n输出：[\"e\",\"b\"]\n解释：一个可行的子序列是 [0,2] ，因为 groups[0] != groups[2] 。\n所以一个可行的答案是 [words[0],words[2]] = [\"e\",\"b\"] 。\n另一个可行的子序列是 [1,2] ，因为 groups[1] != groups[2] 。\n得到答案为 [words[1],words[2]] = [\"a\",\"b\"] 。\n这也是一个可行的答案。\n符合题意的最长子序列的长度为 2 。\n\n
示例 2：
\n\n\n输入：words = [\"a\",\"b\",\"c\",\"d\"], groups = [1,0,1,1]\n输出：[\"a\",\"b\",\"c\"]\n解释：一个可行的子序列为 [0,1,2] 因为 groups[0] != groups[1] 且 groups[1] != groups[2] 。\n所以一个可行的答案是 [words[0],words[1],words[2]] = [\"a\",\"b\",\"c\"] 。\n另一个可行的子序列为 [0,1,3] 因为 groups[0] != groups[1] 且 groups[1] != groups[3] 。\n得到答案为 [words[0],words[1],words[3]] = [\"a\",\"b\",\"d\"] 。\n这也是一个可行的答案。\n符合题意的最长子序列的长度为 3 。\n\n
\n\n
提示：
\n\n1 <= n == words.length == groups.length <= 1001 <= words[i].length <= 10groups[i] 是 0 或 1。words 中的字符串 互不相同 。words[i] 只包含小写英文字母。groups.",
"For each index i in the range [1, n - 1], add i to the answer if groups[i] != groups[i - 1]."
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