Given a string array that contains n elements each composed of lowercase english letters. A substring that contains a certain character .
Given a string array that contains n elements each composed of lowercase english letters. Jul 11, 2025 · Java String toLowerCase () method is used to convert all letters to lowercase in a given string. c) Count the number of distinct characters in s and t. You shall be given Q queries to answer. wordA is a predecessor of wordB if and only if we can insert exactly one letter anywhere in wordA without changing the order of the other characters to make it equal to wordB. Jul 23, 2025 · Given an array of words where each word consists of lowercase English letters, we need to find the longest word chain possible. Jul 12, 2025 · Given an array of strings of lowercase English alphabets. Vowels are in {a, e, i, o, u}. Oct 12, 2018 · You are given a string s consisting of lowercase English letters. The following m lines contain a single query on each line: xi, yi and leni (1 ≤ xi, yi ≤ n, 1 ≤ leni ≤ n - max(xi, yi) + 1) — the description of the pair of the substrings to check. A subsequence is an array that can be derived from another array by deleting some or no elements without changing Dec 26, 2024 · Given two strings s1 and s2, the task is to find the uncommoncharacters in both strings. Given a string array that containsnelements, each composed of lowercase English letters, and q queries, eacl 1-r, for each query, determine how many strings starting from index / and ending at index r have vowels as the character. Output Format A string with removed characters as described Jul 23, 2025 · Iterate through each character in the input string. Array of uppercase and lowercase letters. A string s is formed by the concatenation of a subsequence of arr that has unique characters. We call a string t ideal if the following conditions are satisfied: * t is a subsequence of the string s. Two strings, s, and t, each of length n, that contain lowercase English characters are given as well as an integer K ALL 1 The cost to change the th character in s from sto t is the absolute difference of the ASCII value of characters, i. Second line contains a single integer m (1 ≤ m ≤ 300) — the number of queries. What is the maximum number of strings that can be built? Jul 23, 2025 · Output: a b c d For a given set of size n, there will be n^k possible strings of length k. You have to remove all those characters from str which have already appeared in it, i. A string is good if it can be formed by characters from chars (each character can only be used once for each word in words). Question: given a string array that contains n elements each composed of lowercase English letters Jan 29, 2025 · Given a string array that contains n elements, each composed of lowercase English letters, and q queries, each query of the format l-r, for each query, determine how many strings starting from index l and ending at index r have vowels as the first and last character. A string is consistent if all characters in the string appear in the string allowed. Find the length of the longest substring of Sin which the number of occurrences of each letter is equal. The idea is to start from an empty output string (we call it prefix in following code). The grouping function accepts two integers X and Y Feb 2, 2019 · From Codechef: A string is considered balanced if and only if all the characters occur in it equal number of times. Similarly for another letter result can be found. Character weights are 1 to 26 from a to z as shown below: The weight of a string is the sum of the weights of its characters. You are given a string s, consisting of lowercase English letters and a positive integer k. Can you solve this real interview question? Count Vowel Strings in Ranges - You are given a 0-indexed array of strings words and a 2D array of integers queries. Call the shift () of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a'). For ith query, I need to count the number of ways to choose exactly K equal strings from the list L. Homework help for relevant study solutions, step-by-step support, and real experts. Choose at most K letters from the alphabet that will allow you to build as many strings from array S as possible. Each query queries [i] = [li, ri] asks us to find the number of strings present at the indices ranging from li to ri (both inclusive) of words that start and end with a vowel. For a string of length K, the following operation can be applied: Find the maximum character from index 1 to K, and find the dictionary mapping of the respective maximum character. The Little Elephant loves strings very much. You are required to develop an algorithm that would interpolate the string by replacing the question marks with lowercase English letters such that it can be rearranged to form a palindrome. Given a list that contains N strings of lowercase English alphabets. Example 1: Input: s = "bcabc" Output: "abc" Example 2: Input: s = "cbacdcbc" Output: "acdb" Constraints: * 1 <= s. Now we need to answer Q queries. For example, if a character occurs 3 times in all strings but not 4 times, you need to include that character three times in the final answer. Can you solve this real interview question? Maximum Number of Non-Overlapping Substrings - Given a string s of lowercase letters, you need to find the maximum number of non-empty substrings of s that meet the following conditions: 1. Master online tests from leading companies like Amazon, Google, Stripe, and more. // amount is the amount by which string s is to be shifted. For example: A uniform string consists of a single character repeated zero or more times. The testcases will be generated such that the answer is unique. Longest String Chain - You are given an array of words where each word consists of lowercase English letters. Can you solve this real interview question? Append Characters to String to Make Subsequence - You are given two strings s and t consisting of only lowercase English letters. That is, all the uppercase letters should be converted to lowercase and all the lowercase letters should be converted to uppercase. Vowels are in {a,e,l,0,u). Terms and Conditions apply. Take the lexicographically greatest. The substrings do not overlap, that is for any two substrings s[i. Aug 30, 2025 · NumPy String Exercises, Practice and Solution: Write a NumPy program to check whether each element of a given array is composed of digits only, lower case letters only and upper case letters only. ^ Chegg survey fielded between Sept. Return the length of the longest palindrome that you can create. While those would be what I would like to do with it I'm most interested in how to detect the presence of lowercase letters. Dec 29, 2022 · Time Complexity: O (N * Q) where N is the length of a string and Q is the number of queries. Jul 16, 2024 · In this article, we are going to learn how can we check if a string contains uppercase, lowercase, special characters, and numeric values. Iterate through the original string and replace each lowercase character with the next available sorted one from the hash array. Mar 7, 2019 · 0 The questions was: Given an array A of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list (including duplicates). Given a palindromic string of lowercase English letters palindrome, replace exactly one character with any lowercase English letter so that the resulting string is not a palindrome and that it is the lexicographically smallest one possible. Can you solve this real interview question? Maximum Length of a Concatenated String with Unique Characters - You are given an array of strings arr. Question Given a string array that contains n elements, each composed of lowercase English letters, and q queries, each for each query, determine how many strings starting from index l and ending at index r have vowels as the character. For a letter, say 'e', it is present in { "geeks", "code" }, hence its count is 2. Now, the count of vowels in the range [L, R] can be easily calculated in O (1) as pre [R] - pre [L - 1 Given a string array that contains n elements, each composed of lowercase English letters, and q queries, each for each query, determine how many strings starting from index l and ending at index r have vowels as the character. Jul 19, 2023 · In this problem you will be given a string S , consisting of lowercase alphabets (a-z), in which each character is unique. e. Delete the selected substring in step-1 from string S. In each query, you are provided a substring represented by indices / and r and a character x Your task is to minimize the final length of this substring by performing the following operation any number of times: Feb 11, 2025 · Given a string str containing lowercase alphabets, the task is to count the sub-strings that contain all the vowels at-least one time and there are no consonants (non-vowel characters) present in the sub-strings. First Letter to Appear Twice - Given a string s consisting of lowercase English letters, return the first letter to appear twice. Codeforces. For example, ccc and a are uniform strings, but bcb and cd are not. Input Format First line of input contains a string str of length N. d) Concatenate s and t into a new string. customers who used Chegg Study or Chegg Study Pack in Q2 2024 and Q3 2024. No letter occurs more than once in any string of words. Create the longest possible palindrome by selecting some elements from words and concatenating them in any order. Can you solve this real interview question? String Matching in an Array - Given an array of string words, return all strings in words that are a substring of another word. Examples: Input : #GeeKs01fOr@gEEks07 Output : Upper case letters : 5 Lower case letters : 8 Numbers : 4 Special Characters : 2 Input : *GeEkS4GeEkS* Output : Upper case letters : 6 Lower case letters : 4 Numbers : 1 Special Characters : 2 Approach Jul 18, 2013 · Now build an array for each unique character in the string. Longest Subsequence Repeated k Times - You are given a string s of length n, and an integer k. Example: Input: s = geeksforgeeks Output: geksfor Explanation: After removing duplicate characters such as e, k, g, s, we have Longest Ideal Subsequence - You are given a string s consisting of lowercase letters and an integer k. Jan 9, 2024 · The next line consists of N space-separated lowercase English letters, denoting the elements of the list. Return the lexicographically smallest equivalent string of baseStr by using the equivalency information from s1 and s2. Can you solve this real interview question? Groups of Strings - You are given a 0-indexed array of strings words. Each query queries[i] = [l i, r i] asks us to find the number of strings present at the indices ranging from l i to r i (both inclusive) of words that start and end with a vowel. j] and s[x. The second line of each test case contains n integers a1,a2,…,an (1≤ai≤100). The first line of input contains two space separated integers n and k (1 ≤ n, k ≤ 100 000) — the length of s and the required length of t. , abs (s,-1) Find the maximum length of a substring of s that can be changed to the corresponding substring of t with a total cost less than or equal to K Given an array of strings strs, group the anagrams together. Note the first occurence of each element. Each of the next lines contains a string . The return array for the queries is [2, 3, 0) Given a string array that contains n elements, each composed of lowercase English letters, and q queries, each query of the format r, for each query, determine how many strings starting from index I and ending at index r have vowels as the first and last character Function Description the order Can you solve this real interview question? Count Vowel Substrings of a String - A substring is a contiguous (non-empty) sequence of characters within a string. You have been given a String S consisting of uppercase and lowercase English alphabets. You are given a 0-indexed array of strings words and a 2D array of integers queries. We have given string str of length N, the task is to check whether the given string contains uppercase alphabets, lowercase alphabets, special characters, and numeric values or not. Given a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive can be formed by the sum of some elements in the array. Return the maximum possible length of s. Initialize an empty string to store the missing characters. You are given a string consisting of lowercase letters of the English alphabet. It can be proven that the answer is unique Jul 23, 2025 · Checking for the presence of lowercase letters involves scanning the string and verifying if at least one character is a lowercase letter (from 'a' to 'z'). Given a string array that contains n elements, each composed of lowercase English letters, and q queries, each query of the format l-r, for each query, determine how many strings starting from index l and ending at index r have vowels as the first and last character. You are tasked to find the longest subsequence repeated k times in string s. For example, 'b' is converted to 'a', and 'a' is converted to 'z'. Minimum Window Substring - Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is included in the window. Efficient approach: Create a prefix array pre [] where pre [i] will store the count vowels in the substring str [0i]. Your task is to make s a palindrome with the minimum number of operations possible. length <= 500 * s consists of lowercase English letters. Note that the input will be generated such that s can always be converted to a palindrome. Your task is to remove the minimum number of parentheses ( '(' or ')', in any positions ) so that the resulting parentheses string is valid and return any valid string. A word wordA is a predecessor of wordB if and only if we can insert exactly one letter anywhere in wordA without changing the order of the other characters to make it equal to wordB. A vowel substring is a substring that only consists of vowels ('a', 'e', 'i', 'o', and 'u') and has all five vowels present in it. Given a string s of length N consisting only of lowercase English alphabets. We repeatedly make duplicate removals on s until we no longer can. ascii_lowercase (available on both) and not string. It contains only lowercase English letters. The first line of the input contains the string s (1 ≤ |s| ≤ 10 000) in its initial state, where |s| stands for the length of s. In this article, we will learn how to check if a String contains only lowercase letters in Java. The second line contains string s consisting of n lowercase English letters. Example: Apr 12, 2023 · We are given two strings P and Q, each consisting of N lowercase English letters. Perform the following operation: * Select any non-empty substring then replace every letter of the substring with the preceding letter of the English alphabet. It can be a word or can be a sentence. Given a string word, return the number of vowel substrings in word. May 11, 2020 · The first line of each test file contains a single integer , the length of the string array . // A left shift by 1 means remove the first character of s and append it to the Your Gateway to Success in Online Assessments. You can return the answer in any order. Return the sum of lengths of all good strings in words. Can you solve this real interview question? Reorganize String - Given a string s, rearrange the characters of s so that any two adjacent characters are not the same. Innovative learning tools. A substring that contains a certain character Remove All Adjacent Duplicates In String - You are given a string s consisting of lowercase English letters. Return the minimum number of characters that need to be appended to the end of s so that t becomes a subsequence of s. Using this iterate over all possible strings which can be formed with words ending at index max. The second line of input contains the string s consisting of n lowercase English letters. js // You are given a string s containing lowercase English letters, and a matrix shift, where shift [i] = [direction, amount]: // direction can be 0 (for left shift) or 1 (for right shift). Example 1: Jan 23, 2022 · You are given an array of strings words. Individual results may vary. In one move, you can select any two adjacent characters of s and swap them. Question Given a string s consisting of lowercase English letters and the character "?". All in one place. 2. Suppose we have a list L consisting of all non empty substrings of the string S. "We are given two strings P and Q, each consisting of N lowercase English letters. 24/7 support. The task is for each letter [a-z] to find the count of strings having these letters. Nov 13, 2022 · 4 You are given a string S of length N consisting of lowercase English alphabets and an integer K. Find min and max of the occurences. Iterate through each lowercase letter from 'a' to 'z'. Additionally, you have q queries. Remove redundant characters from stringYou are given a string, str, of length N consisting of lowercase letters of alphabet. Any of the chosen letters can be used multiple times when building the strings. You need to partition the string until it is empty in the following way, Select a maximum length substring from the beginning of string S such that it has at most K distinct characters. * s will contain at least one letter that appears twice. Repeat the process for uppercase characters as well. Respondent base (n=712) among approximately 1,039,954 invites. Problem Description You are given a string s consisting of lowercase English letters. One should choose some symbols from the given string so that any contiguous subsegment of length m has at least one selected symbol. An uncommon character means that the character is present in only one string or in another string but not in both. For each position in the strings, we have to choose one letter from either P or Q, in order to construct a new string S, such that the number of distinct letters in S is minimal. lowercase (only on py2) Jul 23, 2025 · Given a string, str consisting of lowercase English alphabets, the task is to find the number of unique characters present in the string. Today he came with the following problem. The operation allows you to: Select any non-empty substring from s Replace every letter in that substring with the preceding letter in the English alphabet For example: 'b' becomes 'a', 'c' becomes 'b', and so on Feb 10, 2024 · Any help is much appreciated. If two permutations look the same, only print one of them. Sep 11, 2024 · Given a string s which may contain lowercase and uppercase characters. The strings contain only lowercase characters and can have duplicates. You need to then print the resultant String to Jun 17, 2025 · Traverse the given string and update the respective hash arrays based on whether the character is lowercase or uppercase. If there is no such substring, return the empty string "". You are given a string s s of length n n consisting of lowercase English letters and question marks. a) Determine the common characters between s and t. Elevate your skills, boost your confidence, and ace your next corporate assessment with FastPrep. Apr 7, 2025 · Given a string s of lowercase English letters, the task is to find the first non-repeating character. You are given an array of strings words. Any number of contiguous strings can be found together to form a new string. * For example, "abc" is a predecessor of "abac", while "cba" is Raw stringShift. 9–Oct 3, 2024 among a random sample of U. Approaches to Check Whether a String Contains Only Sep 17, 2022 · -3 You are given a string s consisting of lowercase English letters. * The absolute difference in the alphabet order of every two adjacent letters in t is less than or equal to k. The third and the last line of input contains the integer K, denoting the number of indices to be selected. Note: The order of remaining characters in the output should be the same as in the original string. Example 1: Input: s = "aab" Output: "aba" Example 2: Input: s = "aaab" Output: "" Constraints: * 1 <= s. One by one add all characters to prefix. Examples: Input: str = “geeksforgeeks” Output: 7 Explanation: The given string “geeksforgeeks” contains 7 unique characters {‘g’, ‘e’, ‘k’, ‘s’, ‘f’, ‘o’, ‘r’}. Feb 15, 2024 · A string is a data structure that contains a set of characters. Please visit each partner activation page for complete details. You must split this string into a minimal number of substrings in such a way that no letter occurs more than once in each substring. Programming competitions and contests, programming communityAcacius is studying strings theory. S. y], either j < x or i > y is true. Your solution’s ready to go! Given a 1 -indexed String S of length N, consisting of lowercase English alphabets, you need to answer queries based on the properties of this string. In one operation, you can replace a character in s with another lowercase English letter. Count the Number of Consistent Strings - You are given a string allowed consisting of distinct characters and an array of strings words. Return any possible rearrangement of s or return "" if not possible. If the character is an uppercase letter, convert it to lowercase and add it to the set. This array will have the indexes of its occurrence in the given input array. NOTE: For each K we will have different value of K. A duplicate removal consists of choosing two adjacent and equal letters and removing them. Jan 5, 2023 · Given a string array that contains n elements, each composed of lowercase English letters, and q queries, each 1 −r, for each query, determine how many strings starting from index l and ending at index r have vowels as the character. Jan 27, 2017 · There was a problem: You have been given a String consisting of uppercase and lowercase English alphabets. You need to perform exactly one operation on this string to make it lexicographically smallest. Can you solve this real interview question? Longest String Chain - You are given an array of words where each word consists of lowercase English letters. Oct 17, 2012 · Possibly ending up with assigning those letters to a different variable, or just printing the lowercase letters or number of lowercase letters. 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. Return the answer sorted by the frequency from highest to lowest. b) Find the longest common subsequence of s and t. For every character added, print all possible strings with current prefix by recursively calling for k equals to k-1. length <= 1000 * s consists of lowercase English letters Jan 25, 2023 · Given a string 's', the task is to find if the characters of the string are in alphabetical order. A string can contain Uppercase letters, Lowercase letters, or numbers of special characters. Let's number the elements of the array from 1 to n, then let's denote the element number i as ai. Return the minimum number of moves needed to make s a palindrome. Auxiliary Space: O (1), no extra space is required, so it is a constant. Given an array of strings sorted in lexicographical order, print all of its permutations in strict lexicographical order. Given a string Question: You are given a string S consisting of N lowercase letters of the English alphabet. Examples: Input: Str = "aabbbcc" Output: In alphabetical order Input: Str = "aabbbcca" Output: Not in alphabetical order A simple approach: Store the string to a character array and sort the array. If the characters in the sorted array are in the . . Two strings s1 and s2 are said to be connected if the set of letters of s2 can be obtained from the set of letters of s1 by any one of the following operations: * Adding Lexicographically Smallest String After Substring Operation - Given a string s consisting of lowercase English letters. If the character is a lowercase letter, add it to the set. Each string consists of lowercase English letters only. 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. It can be proven that the answer is unique. Note: * A letter a appears twice before another letter b if the second occurrence of a is before the second occurrence of b. Can you solve this real interview question? Minimum Remove to Make Valid Parentheses - Given a string s of '(' , ')' and lowercase English characters. Python provides simple and efficient ways to solve this problem using built-in string methods and constructs like loops and comprehensions. GitHub Gist: instantly share code, notes, and snippets. Dec 28, 2023 · Two strings, s and t, each of length n, that contain lowercase English characters are given, as well as an integer k. Shifting Letters - You are given a string s of lowercase English letters and an integer array shifts of the same length. Also, it can be empty or can have a single letter. Your task is to reorder the letters in the string s in such a way that the resulting string is a k -string. Lexicographically Smallest Palindrome - You are given a string s consisting of lowercase English letters, and you are allowed to perform operations on it. The i -th of the next m lines contains three integers li, ri and ki (1 ≤ li ≤ ri ≤ |s|, 1 ≤ ki ≤ 1 000 000) — the Can you solve this real interview question? Smallest Subsequence of Distinct Characters - Given a string s, return the lexicographically smallest subsequence of s that contains all the distinct characters of s exactly once. Apr 17, 2013 · @CharlieParker No, from the beginning I made sure my answer would work on Python 3 as well as Python 2 at the same time, because i used string. He has an array a from n strings, consisting of lowercase English letters. You are given a string S; this string may only contain uppercase English letters Task A weighted string is a string of lowercase English letters where each letter has a weight. Can you solve this real interview question? Find Words That Can Be Formed by Characters - You are given an array of strings words and a string chars. Top K Frequent Words - Given an array of strings words and an integer k, return the k most frequent strings. The string contains only lowercase characters. The first line of each test case contains a single integer n (3≤n≤100) — the length of the array a. Sep 28, 2022 · Question You are given a string s consisting of lowercase English letters. Each element of words consists of two lowercase English letters. The task is to remove all duplicate characters from the string and find the resultant string. You are given an array S made of N strings and an integer K. Apr 8, 2023 · Given a string, write a program to count the occurrence of Lowercase characters, Uppercase characters, Special characters, and Numeric values. Return the final string after all such duplicate removals have been made. Our intuitive platform offers comprehensive practice assessments to prepare you for the real challenge. It is possible to replace question marks with lowercase English letters in such a way that a string " abacaba " occurs as a substring in a Minimum Number of Moves to Make Palindrome - You are given a string s consisting only of lowercase English letters. Each element can be selected at most once. You need to then print the resultant String to output. , you have to keep only first occurance of each letter. Formally, a parentheses string is valid if and only if: * It is the empty You are given a string s, consisting of lowercase English letters, and the integer m. You need to change the case of each alphabet in this String. Start your journey to career advancement today! Jun 6, 2015 · 0 Given a string S consisting of N lowercase English alphabets. If there is no such character, return '$'. Example 1: Input: word = "aeiouu Jul 23, 2025 · Given a string S containing N lowercase English alphabets and a dictionary Dict that maps all lowercase English alphabets from 'a' to 'z' to either 1 or -1. Another string INF is formed by repeating the string S infinitely many times. ydios i4b oiuzjsc6 eub peajv r65y 4wdwk oxjb dj7qm vn03