You are given an integer n, a 0-indexed string array words, and a 0-indexed binary array groups, both arrays having length n.
You need to select the longest subsequence from an array of indices [0, 1, ..., n - 1], such that for the subsequence denoted as [i0, i1, ..., ik - 1] having length k, groups[ij] != groups[ij + 1], for each j where 0 < j + 1 < k.
Return a string array containing the words corresponding to the indices (in order) in the selected subsequence. If there are multiple answers, return any of them.
\n\nA subsequence of an array is a new array that is formed from the original array by deleting some (possibly none) of the elements without disturbing the relative positions of the remaining elements.
\n\nNote: strings in words may be unequal in length.
\n
Example 1:
\n\n\nInput: n = 3, words = ["e","a","b"], groups = [0,0,1]\nOutput: ["e","b"]\nExplanation: A subsequence that can be selected is [0,2] because groups[0] != groups[2].\nSo, a valid answer is [words[0],words[2]] = ["e","b"].\nAnother subsequence that can be selected is [1,2] because groups[1] != groups[2].\nThis results in [words[1],words[2]] = ["a","b"].\nIt is also a valid answer.\nIt can be shown that the length of the longest subsequence of indices that satisfies the condition is 2.\n\n
Example 2:
\n\n\nInput: n = 4, words = ["a","b","c","d"], groups = [1,0,1,1]\nOutput: ["a","b","c"]\nExplanation: A subsequence that can be selected is [0,1,2] because groups[0] != groups[1] and groups[1] != groups[2].\nSo, a valid answer is [words[0],words[1],words[2]] = ["a","b","c"].\nAnother subsequence that can be selected is [0,1,3] because groups[0] != groups[1] and groups[1] != groups[3].\nThis results in [words[0],words[1],words[3]] = ["a","b","d"].\nIt is also a valid answer.\nIt can be shown that the length of the longest subsequence of indices that satisfies the condition is 3.\n\n\n
\n
Constraints:
\n\n1 <= n == words.length == groups.length <= 1001 <= words[i].length <= 100 <= groups[i] < 2words consists of distinct strings.words[i] consists of lowercase English letters.给你一个整数 n 和一个下标从 0 开始的字符串数组 words ，和一个下标从 0 开始的 二进制 数组 groups ，两个数组长度都是 n 。
你需要从下标 [0, 1, ..., n - 1] 中选出一个 最长子序列 ，将这个子序列记作长度为 k 的 [i0, i1, ..., ik - 1] ，对于所有满足 0 < j + 1 < k 的 j 都有 groups[ij] != groups[ij + 1] 。
请你返回一个字符串数组，它是下标子序列 依次 对应 words 数组中的字符串连接形成的字符串数组。如果有多个答案，返回任意一个。
子序列 指的是从原数组中删掉一些（也可能一个也不删掉）元素，剩余元素不改变相对位置得到的新的数组。
\n\n注意：words 中的字符串长度可能 不相等 。
\n\n
示例 1：
\n\n\n输入：n = 3, 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：n = 4, 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 <= 100 <= groups[i] < 2words 中的字符串 互不相同 。words[i] 只包含小写英文字母。words.",
"For each index i in the range [1, n - 1], add words[i] to the answer if groups[i] != groups[i - 1]."
],
"solution": null,
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"sampleTestCase": "3\n[\"e\",\"a\",\"b\"]\n[0,0,1]",
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