Problem StatementYou wish to help Ashish, who possesses a collection of N strings, some of which may be duplicated, and has been assigned the task of finding the kth unique string.If the number of unique strings is less than k, he needs to display an empty string. Considering you are Ashish's best friend can you assist him with this challenge?Input FormatThe first line contains an integer N denoting the number of strings.The next N lines contain strings.The next line contains an integer k.Output FormatThe output contains the kth distinct string. If there are less than k unique string display an empty string.Constraints1<=N<=105-10^8<=arr[i].length()<=10^8Sample Testcase 0Testcase Input6dbcbca2Testcase OutputaExplanationThe only strings in arr that are distinct are "d" and "a." The letter "d" comes first, making it the first separate string.Because "a" appears second, it is the second distinct string. "a" is returned since k == 2.
Question
Problem StatementYou wish to help Ashish, who possesses a collection of N strings, some of which may be duplicated, and has been assigned the task of finding the kth unique string.If the number of unique strings is less than k, he needs to display an empty string. Considering you are Ashish's best friend can you assist him with this challenge?Input FormatThe first line contains an integer N denoting the number of strings.The next N lines contain strings.The next line contains an integer k.Output FormatThe output contains the kth distinct string. If there are less than k unique string display an empty string.Constraints1<=N<=105-10^8<=arr[i].length()<=10^8Sample Testcase 0Testcase Input6dbcbca2Testcase OutputaExplanationThe only strings in arr that are distinct are "d" and "a." The letter "d" comes first, making it the first separate string.Because "a" appears second, it is the second distinct string. "a" is returned since k == 2.
Solution
Here is a step-by-step solution to the problem:
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First, we need to read the input. The first line of the input gives us the number of strings N. We read this using the appropriate input function of the language.
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Next, we read the N strings. We can do this in a loop that runs N times. In each iteration of the loop, we read a string and add it to a list or array.
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After reading all the strings, we read the value of k.
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Now, we need to find the kth unique string. To do this, we can use a data structure that supports efficient insertion and search of elements, such as a set or a hash table. We iterate over the list of strings, and for each string, we check if it is already in the set. If it is not, we add it to the set.
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While adding strings to the set, we also keep track of the order in which they were added. This can be done by also maintaining a list of the unique strings in the order they were added.
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After we have processed all the strings, we check if the size of the set (or the length of the list of unique strings) is less than k. If it is, we output an empty string.
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If the size of the set is greater than or equal to k, we output the kth element of the list of unique strings. Note that we need to adjust the index when accessing the list, as the indices start from 0, but k starts from 1.
This algorithm ensures that we find the kth unique string in the input, or output an empty string if there are less than k unique strings. The time complexity of the algorithm is O(N), where N is the number of strings, as we need to process each string once. The space complexity is also O(N), as we need to store all the strings in a list and a set.
Similar Questions
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Problem StatementWrite a program to remove the duplicate characters in the given stringInput FormatGiven a stringOutput Formatremove the duplicate characters and print the unique string
Given two integers N and K, the task is to find the string S of minimum length such that it contains all possible strings of size N as a substring. The characters of the string should be from integers ranging from 0 to K-1. Example 1:Input:N = 2, K = 2Output: 00110Explanation: Allowed characters are from 0 to k-1 (i.e., 0 and 1).There are 4 string possible of size N=2 (i.e "00", "01","10","11")"00110" contains all possible string as a substring. It also has the minimum length.Example 2:Input:N = 2, K = 3Output: 0010211220Explanation: Allowed characters are from 0 to k-1 (i.e., 0, 1 and 2).There are total 9 strings possibleof size N, given output string has the minimumlength that contains all those strings as substring.Your Task: You don't need to read input or print anything. Complete the function findString( ) which takes the integer N and the integer K as input parameters and returns the string.Note: In case of multiple answers, return any string of minimum length which satisfies above condition. The driver will print the length of the string. In case of wrong answer it will print -1.Expected Time Complexity: O(KNlogK)Expected Space Complexity: O(KNN)Constraints:1 ≤ N ≤ 41 < K < 101 < KNN < 106
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Emma maintains a grocery list on her phone to keep track of the items she needs to buy. However, sometimes she accidentally adds the same item multiple times. To avoid buying duplicates, she wants a program that can remove any duplicate items from her list, ensuring that each item appears only once.Write a program to help Emma clean up her grocery list by removing duplicate items.Input format :The first line consists of an integer N, representing the number of items on Emma's grocery list.The second line consists of an array of integers of size N, where each integer represents a unique code for each grocery item.Output format :The output displays the list of integers representing the unique item codes from Emma's grocery list, with duplicates removed.
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