How to Solve Smallest K- Length Subsequence With Occurrences of a Letter Problem
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Smallest K-Length Subsequence With Occurrences of a Letter
You are given a string s, an integer k, a letter letter, and an integer repetition. Return the lexicographically smallest subsequence of s of length k that has the letter letter appear at least repeti...
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Understanding the Smallest K- Length Subsequence With Occurrences of a Letter Problem
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Problem Statement
You are given a string s, an integer k, a letter letter, and an integer repetition. Return the lexicographically smallest subsequence of s of length k that has the letter letter appear at least repetition times. The test cases are generated so that the letter appears in s at least repetition times. 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 string a is lexicographically smaller than a string b if in the first position where a and b differ, string a has a letter that appears earlier in the alphabet than the corresponding letter in b.
Smallest K-Length Subsequence With Occurrences of a Letter
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Examples
s = "leet", k = 3, letter = "e", repetition = 1"eet"There are four subsequences of length 3 that have the letter 'e' appear at least 1 time: - "lee" (from "leet") - "let" (from "leet") - "let" (from "leet") - "eet" (from "leet") The lexicographically smallest subsequence among them is "eet".
s = "leetcode", k = 4, letter = "e", repetition = 2"ecde""ecde" is the lexicographically smallest subsequence of length 4 that has the letter "e" appear at least 2 times.
s = "bb", k = 2, letter = "b", repetition = 2"bb""bb" is the only subsequence of length 2 that has the letter "b" appear at least 2 times.
Constraints
1 <= repetition <= k <= s.length <= 5 * 104s consists of lowercase English letters.letter is a lowercase English letter, and appears in s at least repetition times.How Interview Coder Helps with Leetcode Problems
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