# Longest substring with at most k repeating characters

Longest substring with at most k repeating characters. Return the length of the longest substring containing Sep 11, 2020 · Your task is to find the length of the longest substring that contains at most K distinct characters. Longest Substring with At Most K Distinct Characters 🔒 341. The overall function longestSubstring initiates the process by calling dfs(0, len(s) - 1) (i. Input: s = "ababbc", k = 2. That sounds easy enough right? Lets look at a few examples: s = "xyxyxz" k = 2. Explanation: Replace 'B' with 'A', we will get "AAAC" and the longest substring with same character is "AAA" of length 3. 2) cnt - to keep the count of substring without repeating characters. Back to Explore Page. Example 1: Input: s = "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. 340. String polynomial hash Mar 10, 2024 · 💡 Problem Formulation: The specific challenge discussed in this article is to identify the longest substring within a given string that contains exactly k unique characters. Our goal is to find an Given a string s and an integer k, find the length of the longest substring such that the frequency of each character in this substring is greater than or equal to k. The Time Complexity of the algorithm is O (n), where n is the length of the input string because we are iterating through the string using two pointers (left and right) in a single pass. Apr 19, 2023 · This solution uses extra space to store the last indexes of already visited characters. Then the test cases follow. Examples: Input: S = "normal", Q = {"a", "o", "n", "m", "r", "l"}, K = 1 Output: 1Explanation: All the characters in the given string S are present in array. I am trying that age old question (there are multitudes of versions around) of finding the longest substring of a string which doesn't contain repeated characters. So if the string is like “abbaba”, then the output will be 2. The second line contains a positive integer 'k', which represents the maximum number of Oct 28, 2023 · Learn how to solve the problem of finding the longest substring with at least k repeating characters in a given string, using divide and conquer or sliding window techniques, from Grandyang's Blogs. Feb 8, 2024 · In this Longest Repeating Character Replacement problem, we are given a string and an integer we can choose any character of the string and change it to any other uppercase English character. Can you solve this real interview question? Longest Substring with At Most K Distinct Characters - Level up your coding skills and quickly land a job. Let $i$ and $j$ represent the start and end positions of the non-repeating substring, respectively. Example 1: Input: s = "ABAB", k = 2. Explanation: Replace the two 'A's with two 'B's or vice versa. Here's some sample data (first line: sequence, second line: k, suffix table format: parent child location length ): The output from this should be CATAC. Here the substring would be "xyxyx", and the length is 5. Return all words that can Nov 26, 2020 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Description. Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 2: Nov 15, 2023 · Last Updated : 15 Nov, 2023. Can you solve this real interview question? Longest Repeating Character Replacement - Level up your coding skills and quickly land a job. Reverse Vowels of a String 346. Input : P = “giraffe”, Q = “01111001111111111011111111 Longest Substring Without Repeating Characters - LeetCode. The task is to find the longest substring of A that can be converted to the same substring at the same position in B in less than or equal to T cost. A variable ans to store the length of the longest substring found, set to 0. Output : 1. Examples: Input : P = "normal", Q = "00000000000000000000000000", K=1 O Example 1: Input: s ="aababcbb"Output: 3Explanation: The longest substring without repeating characters is "abc". Mar 24, 2023 · Given a string str consisting of lowercase characters, the task is to find the total number of unique substrings with non-repeating characters. Java Solution. The task is to find the length of the longest substring of S having all characters the same as character K. If k is more than the total number of distinct characters in the string, return the whole string. Dec 14, 2020 · Input: str="AABC" k=1. Output: 4. Return the length of the longest substring containing the same letter you can get after performing the Longest Repeating Character Replacement - You are given a string s and an integer k. Can you solve this real interview question? Longest Substring Without Repeating Characters - Level up your coding skills and quickly land a job. The longest substring is "ababb", as 'a' is repeated 2 times and 'b' is repeated 3 times. Better than official and forum solutions. Example 1: Input: s = "aaabb", k = 3 O Aug 30, 2021 · Given a string and a positive number k, find the longest substring of the string containing k distinct characters. The Space Complexity is constant, O (1), or O (256) in terms of the character set. In-depth solution and explanation for LeetCode 3. Example 1: Input: S = "geeksforgeeks" Output: 7 Explanation: Longest substring is "eksforg". The length of the longest non-repeating substring is recorded by ans. May 30, 2019 · Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Nov 26, 2020 · Longest Substring with At Least K Repeating Characters | Live Coding with Explanation | Leetcode #395 LeetCode 3. Example 2: Input: S = "abdefgabef&q. Aug 30, 2021 · The problem differs from the problem of finding the longest subsequence with distinct characters. Example 2: Input: s ="cccc"Output: 1Explanation: The longest substring without repeating characters is "c". The Longest Repeating Character Replacement problem on leetcode asks us to find the longest substring in a given string s, where we can replace at most k characters in the substring such that all the characters in the substring are the same. We will return 0 if no repeating substring is present. Input Format: The first line contains an Integer 'T' which denotes the number of test cases/queries to be run. If the current element is the same as the previous element then increment temp. Examples: Input: S = “normal”, Q = {“a”, “o”, “n”, “m”, “r”, “l”}, K = 1. ". Example 3: Input: s =""Output: 0. Take two variables ans and temp. Example 1: Input: s = "aaabb", k = 3 Output: 3 Explanation: The longest substring is "aaa", as 'a' is repeated 3 times. Apr 30, 2020 · Longest Repeating Substring in C - Suppose we have a string S, we have to find the length of the longest repeating substring(s). Example for Longest Substring with At Least K Repeating Characters: Test Case 1 Longest Substring with At Least K Repeating Characters Problem. Reverse String 345. Output: 3. Approach Idea: Menu. Find the length of a longest substring containing all repeating letters you can get after performing the above operations. Sliding Window Maximum; 2831. Longest Substring with At Least K Repeating Characters - LeetCode Sep 15, 2023 · 這題的題目在這裡. This was a tough problem for me to wrap my head around. Can you solve this real interview question? Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without repeating characters. Longest Substring with At Least K Repeating Characters - Given a string s and an integer k, return the length of the longest substring of s such that the frequency of each character in this substring is greater than or equal to k. Example 1: Input: s = "eceba". Input: s = "aa", k = 1 Output: 2 Explanation: The substring is "aa" with length 2. 4)loop through each char of the string. But we first need to split the input string by using the characters whose occurrence < k. It is guaranteed that all characters of the String S will be lowercase letters from 'a' to 'z'. The task is to find the length of the longest substring with at most K normal characters. Traverse through the string from left to right. Explanation for Longest Substring with At Most K Distinct Characters LeetCode Solution: i) For the first test case, “acc” is the longest substring with at most 2 unique characters. Given a string s and an integer k, return the length of the longest substring of s such that the frequency of each character in this substring is greater than or equal to k. Find the length of the longest substringTof a given string (consists of lowercase letters only) such that every character inTappears no less thanktimes. Can you solve this real interview question? Longest Substring with At Least K Repeating Characters - Level up your coding skills and quickly land a job. Given a string you need to print the size of the longest possible substring that has exactly K unique characters. Perform the Longest common subsequence where s1 [i]==s1 [j] and i!=j. Return the length. Output: 1. Longest Substring with Repeating Characters problem can be solved using DFS. Jun 3, 2022 · Given a string str and an integer K, the task is to find the length of the longest substring S such that every character in S appears at least K times. C++ Server Side Programming Programming. Jan 11, 2018 · This is a question regarding question #395 on LeetCode, entitled "Longest Substring with At Least K Repeating Characters. Power of Four 343. Intuitions, example walk through, and complexity analysis. For k = 5, o/p is ‘abcbdbdbbdcdabd’. Length of longest non-repeating substring can be recursively. This problem is similar to the previous problem Longest Substring with K Longest Repeating Character Replacement - You are given a string s and an integer k. Example 2: January 27th - Advanced Problem - Longest Substring with At Least K Repeating CharactersDiscord: https://go. If there is no such subsequence, return an empty string. Output: 0. Longest Substring Without Repeating Characters in Python, Java, C++ and more. If there is no possible substring then print -1. If the current element is not equal to the previous element then make temp as 1 and update ans. We can perform this operation at most k times. Flatten Nested List Iterator 342. Input: s = "eceba", k = 2 Output: 3 Explanation: The substring is "ece" with length 3. Initialize variables: A hash set ss to store characters of the current substring without repeating ones. Longest Substring with At Least K Repeating Characters; 209. Given a string S, an integer K and set of characters Q [], the task is to find the longest substring in string S which contains atmost K characters from the given character set Q []. 4 days ago · Given a string S and an integer k, the task is to return the number of substrings in S of length k with no repeated characters. If str[i-1] == str[j-1] && (j-i) > LCSRe(i-1, j-1) Oct 4, 2023 · Given a string s of length N, and Q queries, each of type (K, C) where K is an integer C is a character, the task is to replace at most K characters of the string by C and have to print the maximum length of possible substring containing only character C. Can you solve this real interview question? Longest Repeating Character Replacement - You are given a string s and an integer k. Solution. Intersection of Two Arrays 350. TL;DR Longest substring repeating atleast k times. The substring "BBBB" has the longest repeating letters, which is 4. Nov 16, 2012 · For this algorithm to work I need to be able to get the longest k-peat of an ~40,000 length string in less than 5 minutes. Explanation: The substring is "ece" which its length is 3. Example 3: Input: s Mar 27, 2024 · Now, we recommend you practice problem sets based on the concepts of finding the Longest Substring with At Least K Repeating Characters to master your fundamentals. Apr 15, 2020 · There was large discussion in comments, I think it's better write an answer to sum up. Consider the input string s = "abcabcbb". Example 2: Input: s = "bbbbb" Output: 1 Explanation: The answer Jul 5, 2022 · The basic idea is to find the longest repeating suffix for all prefixes in the string str. Return the length of the longest substring containing the same letter you can get after performing the above Longest Substring Without Repeating Characters - LeetCode. Sep 22, 2021 · I am working on the task to get the longest substring with k distinct characters. Find the The problem Longest Substring with At Least K Repeating Characters LeetCode Solution says given a string S and an integer k, return the length of the longest substring of S such that the frequency of each character in this substring is greater than or equal to k. e. Input: str = “ababacb”, K = 3. Apr 29, 2023 · Given a string S and a character K. You can perform this operation at most k times. Count Complete Subarrays in an Array; 239. Example 2: Longest Repeating Character Replacement. Hence, we can select any substring of length 1. Maximum Beauty of an Array After Applying Operation; 2781. defined as below. Example 1:Input:S = "aabacbebebe", K = 3Output: 7Explanation: "cbebebe" is the. Dec 20, 2021 · Given a string P consisting of small English letters and a 26-digit bit string Q, where 1 represents the special character and 0 represents a normal character for the 26 English alphabets. Return the length of the longest substring containing the same letter you can get after performing the above Longest Substring with At Least K Repeating Characters - Level up your coding skills and quickly land a job. Return the length of the longest substring containing the same letter you can get after performing the above Longest Repeating Character Replacement - You are given a string s and an integer k. Constraints: 0 <= s. Happy Learning!!! We would like to show you a description here but the site won’t allow us. Examples: Input: str = “aabbba”, K = 3. In this solution, a hashmap is used to track the unique elements in the map. , for the whole string) and returns the result. Integer Break 344. Example 1: Input: s = "aaabb", k = 3. Example 1: Copy Longest Substring with At Least K Repeating Characters - Level up your coding skills and quickly land a job. Longest Substring with At Least K Repeating Characters - LeetCode Jan 24, 2024 · The length of the longest substring without repeating characters is 5. . " May 25, 2022 · The task is to find the largest substring which consists of the same characters. When a third character is added to the map, the left pointer needs to move right. This problem is similar to the previous problem Longest Substring with K Aug 2, 2023 · The task is to find the length of the longest substring with at most K normal characters. We have to perform the above operation in such a way that we can get the length of the longest substring. Explanation: Replace the one 'A' in the middle with 'B' and form "AABBBBA". The longest substring is "aaa", as 'a' is repeated 3 times. edu/dscdiscordMake sure to join us on our cha Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa", as 'a' is repeated 3 times. For instance, in the string "aabbcc", the longest substring with 2 unique characters is either "aabb" or "bbcc", both of which have a length of 4. Sliding Window - template Window Sliding Technique is a computational technique which aims to reduce the use of nested loop and replace it with a single loop, thereby reducing the time complexity. fiu. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa", as 'a' is repeated 3 times. Return the length of the longest substring containing the same letter you can get after performing the above operations. Explanation: The substring is "aabbb" which its length is 5. Examples : Input: s = "yamatonadeshiko", N = 15, Q = 10, queries[] = {{1, a}, {2, a}, {3, a}, Mar 31, 2020 · Given a string, find the length of the longest substring in it with no more than K distinct characters. Example 2: Input: s = "ccaabbb". Aug 2, 2023 · Given a string P consisting of small English letters and a 26-digit bit string Q, where 1 represents the special character and 0 represents a normal character for the 26 English alphabets. Example 1: Input: s = "aaabb", k = 3 Output: 3 Explanation: The longest Feb 10, 2013 · For example, given “abcbbbbcccbdddadacb”, the longest substring that contains 2 unique character is “bcbbbbcccb”. Input: s = "AABABBA", k = 1. ii) For the second test case, either “a” or “b” are the longest substring with at most 1 unique character. For k = 2, o/p is ‘bdbdbbd’. Longest Substring with At Least K Repeating Characters - LeetCode Longest Repeating Character Replacement - LeetCode. So, if the input is like s = "eceba", k = 2, then the output will be 3 as T is "ece" which its length is 3. After the loop, ans will contain the length of the longest valid substring of the original substring s[l:r+1] where all characters' frequencies are at least k, and we return this value. Output: "let". if no such substring exists, return 0. Output: 5. Mar 23, 2023 · The starting point is incremented because during last update on ending point character count exceed k and it will only increase further. Moving Average from Data Stream 🔒 347. Example 1: Input: s ="aababcbb"Output: 3Explanation: The longest substring without repeating characters is "abc". Mar 1, 2018 · "Write a JavaScript function to find longest substring in a given a string without repeating characters. When all chars in the input string occurs >=k, return the length. The idea is to scan the string from left to right, keep track of the maximum length Non-Repeating Character Substring seen so far in res. The first line of input for each test case/query contains an integer K. Example: Input: String="araaci", K=2 Output: 4 Explanation: The longest substring with no more than '2' distinct characters is "araa". Lets look at another example: s = "blame Can you solve this real interview question? Longest Repeating Character Replacement - Level up your coding skills and quickly land a job. Here is my code is taken from this site: // Define the character range. Example 2: Input: s = "bbbbb" Output: 1 Explanation: The answer is "b", with the length of 1. Return the length of the longest substring containing the same letter you can get after performing the above operations Define a hash table to record the characters in the current window. Given a string that consists of only uppercase English letters, you can replace any letter in the string with another letter at most k times. You can choose any character of the string and change it to any other uppercase English character. Given a string S, find the length of the longest substring without repeating characters. You can get a wide range of questions similar to the problem of finding the Longest Substring with At Least K Repeating Characters on Coding Ninjas Studio. For k = 3, o/p is ‘bcbdbdbbdcd’. Feb 10, 2013 · For example, given “abcbbbbcccbdddadacb”, the longest substring that contains 2 unique character is “bcbbbbcccb”. Return the longest subsequence repeated k times in string s. Longest Repeating Character Replacement - You are given a string s and an integer k. Sep 15, 2023 · 這題的題目在這裡. Someone posted a remarkably concise solution (in Python), and I am having trouble understanding the idea at the core of this approach. LCSRe(i, j) stores length of the matching and. Input Format : The first line contains a string 'str' consisting of uppercase English alphabet letters. If r -l + 1 - maxLen <= k, we are able to change all the other characters in the sliding window to the highest frequency character. Longest Substring Which Contains 2 Unique Characters. So no subsequent substring with given fixed starting point will be a substring with each character count at most k. 1. Examples: Input : P = “normal”, Q = “00000000000000000000000000”, K=1. Mar 16, 2012 · Algorithm: 1) Initialise an empty dictionary dct to check if any character already exists in the string. Note: In formal language theory and computer science, a substring is a contiguous sequence of characters within a string. Longest Substring with At Least K Repeating Characters - Level up your coding skills and quickly land a job. Example: input : abcbdbdbbdcdabd. s consists of English letters, digits, symbols, and spaces. Apr 24, 2023 · Given a string S, an integer K and set of characters Q[], the task is to find the longest substring in string S which contains atmost K characters from the given character set Q[]. Given a string s and an integer k, return the length of the longest substring ofsthat contains at mostkdistinct characters. Suppose we have a string; we have to calculate the length of the longest substring T that contains at most k distinct characters. Example 1: Input: s = "letsleetcode", k = 2. Longest Substring with At Most K Distinct Characters; 395. Top K Frequent Elements 348. length <= 5 * 10 4. Explanation: There are two longest subsequences repeated 2 times: "let" and "ete". At each step, we get the sliding window size r - l + 1, we also update the character frequency freq [c] and find the character with the highest frequency maxLen, for all the characters in the sliding window. “string” is a substring of “substring”. “解題教學 : Leetcode #3 Longest Substring Without Repeating Characters” is published by 可愛小松鼠 Cute Squirrel. As the longest repeating substring is “ab” or “ba”. There is less efficient method, but it's really easier to understand than suffix trees: all you need to know is polynomial hashing and binary search. Design Tic-Tac-Toe 🔒 349. Length of the Longest Valid Substring; 2799. Constraints: 1 ≤ |S| ≤ 105. 3) l and r are the two pointers initialised to first index of the string. Dec 5, 2021 · We can create all substrings without repeating characters and then find the one that has the longest length. Nov 2, 2021 · YASH PAL November 02, 2021. Minimum Size Subarray Sum; 2779. You are given a string s and an integer k. Two pointers: i (start of the window) set to 0, and j (end of the window) also set to 0. To solve this, we will follow these steps −. In this Leetcode Longest Repeating Character Replacement problem solution, You are given a string s and an integer k. Explanation: In substring “aabbba”, each character repeats at least k times and its length is 6. Longest Substring Without Repeating Characters Better solution. Medium. May 7, 2016 · Given a string s, return the length of the longest substring that contains at most two distinct characters. or just find the first character that 340. If multiple such subsequences are found, return the lexicographically largest one. Return the length of the longest substring containing the same letter you can get after performing the above Can you solve this real interview question? Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without repeating characters. This is the best place to expand your knowledge and get prepared for your next interview. Dec 27, 2023 · Longest Substring of A that can be changed to Substring of B in at most T cost Given two strings A and B of the same length and two positive integers K and T. Return the length of the longest substring containing the same letter you can get after performing the above Feb 17, 2023 · Time Complexity: O (m*n) Auxiliary Space: O (m*n) Method 3: To find the length of the Longest Repeating Subsequence dynamic programming Top-down Approach: Take the input string. with i'th and j'th characters. Output: 6. Unlike subsequences, substrings are required to occupy consecutive positions within the original string. Explanation : In string Q all characters are normal. Return the length of the longest substring containing the same letter you can get after performing the above operations LeetCode Solutions in C++20, Java, Python, MySQL, and TypeScript. Output:3. Thoughts: find the smallest count character c in the array, split the string s with the character c and resursively calling the all the substring, return the max value from them. non-overlapping substrings ending. Jun 8, 2021 · Find the longest substring without repeating any characters. io cu zh ww iw ww qe se ec ku