Class Solution
Medium
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.
A 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.
Note: strings in words
may be unequal in length.
Example 1:
Input: n = 3, words = [“e”,“a”,“b”], groups = [0,0,1]
Output: [“e”,“b”]
Explanation: A subsequence that can be selected is [0,2] because groups[0] != groups[2].
So, a valid answer is [words[0],words[2]] = [“e”,“b”].
Another subsequence that can be selected is [1,2] because groups[1] != groups[2].
This results in [words[1],words[2]] = [“a”,“b”].
It is also a valid answer.
It can be shown that the length of the longest subsequence of indices that satisfies the condition is 2.
Example 2:
Input: n = 4, words = [“a”,“b”,“c”,“d”], groups = [1,0,1,1]
Output: [“a”,“b”,“c”]
Explanation: A subsequence that can be selected is [0,1,2] because groups[0] != groups[1] and groups[1] != groups[2].
So, a valid answer is [words[0],words[1],words[2]] = [“a”,“b”,“c”].
Another subsequence that can be selected is [0,1,3] because groups[0] != groups[1] and groups[1] != groups[3].
This results in [words[0],words[1],words[3]] = [“a”,“b”,“d”].
It is also a valid answer.
It can be shown that the length of the longest subsequence of indices that satisfies the condition is 3.
Constraints:
1 <= n == words.length == groups.length <= 100
1 <= words[i].length <= 10
0 <= groups[i] < 2
words
consists of distinct strings.words[i]
consists of lowercase English letters.
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionjava.util.List
<java.lang.String> getWordsInLongestSubsequence
(int n, java.lang.String[] words, int[] groups) Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Constructor Details
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Solution
public Solution()
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Method Details
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getWordsInLongestSubsequence
public java.util.List<java.lang.String> getWordsInLongestSubsequence(int n, java.lang.String[] words, int[] groups)
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