Longest Subsequence Repeated k Times
You are given a string s of length n, and an integer k.
You are given a string s of length n, and an integer k. You are tasked to find the longest subsequence repeated k times in string s.
A subsequence is a string that can be derived from another string by deleting some or no characters without changing the order of the remaining characters.
A subsequence seq is repeated k times in the string s if seq * k is a subsequence of s, where seq * k represents a string constructed by concatenating seq k times.
Return the longest subsequence repeated k times in string s. If multiple such subsequences are found, return the lexicographically largest one. If there is no such subsequence, return an empty string.
Example 1
Input: s = "letsleetcode", k = 2
Output: "let"
Explanation: There are two longest subsequences repeated 2 times: "let" and "ete". "let" is the lexicographically largest one.
Example 2
Input: s = "bb", k = 2
Output: "b"
Explanation: The longest subsequence repeated 2 times is "b".
Example 3
Input: s = "ab", k = 2
Output: ""
Explanation: There is no subsequence repeated 2 times. Empty string is returned.
Constraints
- n == s.length
- 2 <= k <= 2000
- 2 <= n < min(2001, k * 8)
- s consists of lowercase English letters.
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