How to Solve Longest Subsequence Repeated k Times Problem
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Longest Subsequence Repeated k Times
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 b...
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Understanding the Longest Subsequence Repeated k Times Problem
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Problem Statement
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. For example, "bba" is repeated 2 times in the string "bababcba", because the string "bbabba", constructed by concatenating "bba" 2 times, is a subsequence of the string "bababcba". 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.
Longest Subsequence Repeated k Times
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Examples
s = "letsleetcode", k = 2"let"There are two longest subsequences repeated 2 times: "let" and "ete". "let" is the lexicographically largest one.
s = "bb", k = 2"b"The longest subsequence repeated 2 times is "b".
s = "ab", k = 2""There is no subsequence repeated 2 times. Empty string is returned.
Constraints
n == s.length2 <= k <= 20002 <= n < min(2001, k * 8)s consists of lowercase English letters.How Interview Coder Helps with Leetcode Problems
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