Kth lexicographically smallest string Oct 3, 2025 · Given three positive integers A, B, and K, the task is to find the Kth lexicographically smallest binary string that contains exactly A number of 0s and B number of 1s. Your task is to make s a palindrome with the minimum number of operations possible. Better than official and forum solutions. K-th Smallest in Lexicographical Order - Given two integers n and k, return the kth lexicographically smallest integer in the range [1, n]. Jul 15, 2025 · Given two integers N and K, the task is to find lexicographically Kth string of length N. If s Bob has a lucky number k, and he wants the kth lexicographically smallest instructions that will lead him to destination. Remove the top of stack X and append it to the end of another string Y which is initially empty. Return the lexicographically smallest subsequence of s of length k that has the letter letter appear at least repetition times. Aug 26, 2014 · Given N A'sand N B's How to find Kth lexographically smallest string of all the strings of length 2*N. $o (k)$) algorithm for computing the $k$-th smallest string of length $l$ in lexicographic order? For example, The first string of length 1 is a, the second string of length 3 is aab, the 5th string of length 5 is aaacc (following aaabb, aaabc, aaabd, and aaacb), etc. If the number of possible strings of length N is less than K, print -1. However, rather than using heap Jul 10, 2015 · I have a string input by the user and an integer k. Dec 30, 2015 · The smallest lexicographical order is an order relation where string s is smaller than t, given the first character of s (s1) is smaller than the first character of t (t1), or in case they are equivalent, the second character, etc. A substring of s is beautiful if the number of 1's in it is exactly k. If d ≤ k , we change the current character to this character, subtract d from k , end the enumeration, and continue to the next position. If no such string exists, print "Impossible" (without quotes). Aug 16, 2015 · 6*8! = 241,920 is the largest multiple of 8! which is smaller than 274,240, so I need the 6th-smallest symbol of the remaining set, which is 7. Intuitions, example walk through, and complexity analysis. Return the lexicographically smallest beautiful substring of string s with length equal to len. For each position, we enumerate all characters less than the current character, calculate the cost d to change to this character. Is there an efficient (i. Jul 23, 2025 · Given a string S of N characters, the task is to find the smallest lexicographical string after performing each of the following operations N times in any order: Remove the 1st character of S and insert it into a stack X. Return the lexicographically smallest equivalent string of baseStr by using the equivalency information from s1 and s2. Return the kth string of this list or return an empty string if there are less than k happy strings of length n. In one operation, you can replace a character in s with another lowercase English letter. If there are multiple In-depth solution and explanation for LeetCode 2734. Lexicographically Smallest Equivalent String in Python, Java, C++ and more. For cbacdcbc Return the lexicographically smallest string with length equal to n and numeric value equal to k. Given an integer array destination and an integer k, return the kth lexicographically smallest instructions that will take Bob to destination. TheRealLeviAckerman's blog [Doubt] k'th lexicographically smallest string By TheRealLeviAckerman, history, 3 years ago, Your task is to find the k -th smallest integer when all integers from 1 to n are sorted in lexicographical order (dictionary order). The test cases are generated so that the letter appears in s at least Nov 30, 2022 · The task is to print the lexicographically smallest permutation of the given string such that the count of subsequences of x y xy is p p and of y x yx is q q . Mar 27, 2024 · In this article, we will learn to find the Kth lexicographically smallest string of integers of length N such that each substring's products should be unique. and 'z' = 26. Jul 23, 2025 · Given a string S of length N and an integer K, the task is to find the frequency of the lexicographically Kth smallest character present in the given string. Can you solve this real interview question? Shortest and Lexicographically Smallest Beautiful String - You are given a binary string s and a positive integer k. We're generating strings based on specific rules. Mar 27, 2024 · This article will discuss the problem “Kth lexicographically smallest distinct string from a given array of strings”, the solution approach to this problem, its C++ implementation, and its time and space complexity. Examples: Input : str[] = "abc", n = 3 Output : Result = "bac" Explanation : All possible permutation in sorted order: abc, acb, bac, bca, cab, cba Input : str[] = "aba", n = 2 Output : Result = "aba" Explanation : All possible permutation in sorted order: aab, aba Can you solve this real interview question? Lexicographically Smallest Generated String - You are given two strings, str1 and str2, of lengths n and m, respectively. . The third string is "c". How do I get the lexicographically kth smallest character from the input string? Learn how to find the Kth smallest N-length lexicographically smallest string in Python with detailed examples and explanations. Suppose we are given a string abc then its substrings in lexicographical order In-depth solution and explanation for LeetCode 440. If the number of steps under the prefix is less than or equal to k, it means the kth number is not in this subtree, so we skip it by moving to the next prefix. Note that a string x is lexicographically smaller than string y if x comes before y in dictionary order, that is, either x is a prefix of y, or if i is the first position such that x [i] != y [i], then x [i] comes before y [i] in alphabetic order. Otherwise, we dive into the subtree by appending a digit (multiplying the prefix by 10) and decrement k accordingly. Example 1: Input: abczd Output: abcd Example 2: Input: abcda Output: abca Explanation: One can remove d to get abca, which is the lexicographically smallest string possible Can you solve this real interview question? Lexicographically Smallest String After Operations With Constraint - You are given a string s and an integer k. You have to find the n-th permutation of string lexicographically. May 8, 2023 · Given String str and an integer k, find the lexicographically smallest and largest substring of length k Lexicography order, also called as alphabetical order or dictionary order, Jul 26, 2025 · Given three non-negative integers, X, Y, and K, the task is to find the Kth smallest lexicographical string having X occurrences of character 'a' and Y occurrences of character 'b'. Mar 9, 2024 · Problem Formulation: The challenge involves writing a program in Python to determine the kth smallest string of length n, ordering strings in lexicographical order (i. e. Example 1: Input: n = 13, k = 2 Output: 10 Explanation: The lexicographical order is [1, 10, 11, 12, 13, 2, 3, 4, 5, 6, 7, 8, 9], so the second smallest number is 10. A string a is lexicographically smaller than a string b (of the same length) 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. 1061 Lexicographically Smallest Equivalent String | LeetCode 3403 Find the Lexicographically Largest String From the Box I | Leetcode Return the lexicographically smallest string you can obtain by applying the above operations any number of times on s. Lexicographical order means numbers are sorted as if they were strings. Can you solve this real interview question? 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. Microsoft Online Assessment (OA) - Lexicographically Smallest String Given a string str, the task is to find the lexicographically smallest string that can be formed by removing at most one character from the given string. Dec 7, 2023 · Given a circular string s, find whether there exists a permutation of s which is a K-periodic circular string and if it exists then find the lexicographically smallest permutation of s which is a K-periodic circular string. Sep 8, 2015 · I want to find lexicographically Kth smallest substring of a given string when the duplicate substrings are allowed. After the traversal, we get a string that meets the conditions. In-depth solution and explanation for LeetCode 1061. Example 1: Input: n = 1, k = 3 Output: "c" Explanation: The list ["a", "b", "c"] contains all happy strings of length 1. So the prefix should be 27 by now. Kth Smallest Instructions in Python, Java, C++ and more. k is 1-indexed. The consecutive swaps mean at one swap the character at index i can be swapped with character at index i - 1 or i + 1. Dec 22, 2022 · The task is to print the lexicographically smallest string of length N consisting of lower-case English alphabets such that the sum of the characters of the string equals K where 'a' = 1, 'b' = 2, 'c' = 3, . Need to solve for kth smallest/largest? Yes: We need to find the k-th string in lexicographically sorted order. Jul 15, 2020 · Given a number in form of string str and an integer K, the task is to find the smallest integer that can be formed after performing at most K consecutive swaps. So aaabbb is smaller than aaac because although the first three characters are equal, the fourth character b is smaller than the fourth character c. Let len be the length of the shortest beautiful substring. Can you solve this real interview question? Lexicographically Smallest String After Operations With Constraint - You are given a string s and an integer k. Apr 27, 2023 · The task is to print the K-th lexicographically the smallest one among the different substrings of s. Examples: Input: str = "76921", K = 3 Output: 27691 Explanation: 27691 is the lexicographical smallest possible Aug 13, 2025 · This blog will discuss the problem to find the lexicographically smallest K-length subsequence from a given string in C++, Java, and Python language along with the time and space complexity. Like if N=2 It means we have 2A and 2B then if we need to find say 2(=K) smallest lexographic For example, given the equivalency information from s1 = "abc" and s2 = "cde", "acd" and "aab" are equivalent strings of baseStr = "eed", and "aab" is the lexicographically smallest equivalent string of baseStr. A string word of length n + m - 1 is defined to be generated by str1 and str2 if it satisfies the following conditions for each index 0 <= i <= n - 1: * If str1[i] == 'T', the substring of word with size m starting at index i is We can traverse each position of the string s . , dictionary order). K-th Smallest in Lexicographical Order in Python, Java, C++ and more. A substring of s is a string obtained by taking out a non-empty contiguous part in s. Example: Input: S = "cab" Can you solve this real interview question? Lexicographically Smallest Palindrome - You are given a string s consisting of lowercase English letters, and you are allowed to perform operations on it. Examples: May 3, 2023 · Given a string of length m containing lowercase alphabets only. Here's a step-by-step walkthrough: Is it a graph? No: The problem doesn't involve nodes and edges or graph traversal. However, rather than using heap Flowchart Walkthrough First, let's pin down the algorithm using the Flowchart. Flowchart Walkthrough First, let's pin down the algorithm using the Flowchart. The time In-depth solution and explanation for LeetCode 1643. Can you solve this real interview question? K-th Smallest in Lexicographical Order - Given two integers n and k, return the kth lexicographically smallest integer in the range [1, n]. 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