You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters.Return the maximum possible length of s.A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements. Example 1:Input: arr = ["un","iq","ue"]Output: 4Explanation: All the valid concatenations are:- ""- "un"- "iq"- "ue"- "uniq" ("un" + "iq")- "ique" ("iq" + "ue")Maximum length is 4.
Question
You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters.Return the maximum possible length of s.A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements. Example 1:Input: arr = ["un","iq","ue"]Output: 4Explanation: All the valid concatenations are:- ""- "un"- "iq"- "ue"- "uniq" ("un" + "iq")- "ique" ("iq" + "ue")Maximum length is 4.
Solution
The problem is asking to find the maximum length of a string that can be formed by concatenating some of the strings from the given array. The string should have unique characters.
Here are the steps to solve this problem:
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Initialize a variable
max_lento 0. This variable will keep track of the maximum length of the string with unique characters. -
Generate all possible combinations of the strings in the array. You can do this by using a recursive function that generates all subsets of the array.
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For each combination, concatenate the strings and check if the resulting string has unique characters. You can do this by using a set. Add each character of the string to the set and check if the size of the set is equal to the length of the string. If it is, then all characters in the string are unique.
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If the string has unique characters, update
max_lenwith the length of the string if it is greater than the currentmax_len. -
After checking all combinations,
max_lenwill be the maximum length of a string with unique characters that can be formed by concatenating some of the strings from the array. -
Return
max_len.
This algorithm has a time complexity of O(2^n), where n is the number of strings in the array. This is because in the worst case, we have to generate all subsets of the array, which is 2^n.
Similar Questions
Write a function to find the longest common prefix string amongst an array of strings.If there is no common prefix, return an empty string "". Example 1:Input: strs = ["flower","flow","flight"]Output: "fl"Example 2:Input: strs = ["dog","racecar","car"]Output: ""Explanation: There is no common prefix among the input strings. Constraints:1 <= strs.length <= 2000 <= strs[i].length <= 200strs[i] consists of only lowercase English letters.
Given two strings text1 and text2, return the length of their longest common subsequence. If there is no common subsequence, return 0.A subsequence of a string is a new string generated from the original string with some characters (can be none) deleted without changing the relative order of the remaining characters.For example, "ace" is a subsequence of "abcde".A common subsequence of two strings is a subsequence that is common to both strings. Example 1:Input: text1 = "abcde", text2 = "ace" Output: 3 Explanation: The longest common subsequence is "ace" and its length is 3.
Given a pair of strings of equal lengths, Geek wants to find the better string. The better string is the string having more number of distinct subsequences. If both the strings have equal count of distinct subsequence then return str1.Example 1:Input:str1 = "gfg", str2 = "ggg"Output: "gfg"Explanation: "gfg" have 7 distinct subsequences whereas "ggg" have 4 distinct subsequences. Example 2:Input: str1 = "a", str2 = "b"Output: "a"Explanation: Both the strings have only 1 distinct subsequence. Your Task:You don't need to read input or print anything. Your task is to complete the function betterString() which takes str1 and str2 as input parameters and returns the better string.Expected Time Complexity: O( max( str1.length, str2.length ) )Expected Auxiliary Space: O( max( str1.length, str2.length ) )Constraints:1 <= str1.lenght , str2.length <= 30
Longest Substring Without Repeating Characters
Raju is preparing questions for the internal test. While creating questions, he gave one such question to his son Arun to solve. Raju has given the string S to his son Arun. Arun's task is to print the size of the longest possible substring that has exactly K unique characters.ExampleInput:String = aabacbebebe; K = 3Output:The substring will be cbebebe with length 7. Explanation:The unique characters in the string are: 'a', 'b', 'c', and 'e'. The longest subsequence with at most 3 distinct characters is "aabacbe". It contains the characters 'a', 'b', and 'c', which is the maximum number of distinct characters allowed (k = 3). Therefore, the length of the longest subsequence is 7.Input format :The first line of input consists of the string S.The second line of input consists of the integer K.Output format :The output prints the size of the longest possible substring that has exactly K unique characters.Refer to the sample output for the formatting specifications.Code constraints :1≤ string length ≤ 501≤ K ≤10Sample test cases :Input 1 :aabacbebebe3Output 1 :7Input 2 :abbc1Output 2 :2
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