Series: #atmostkdistinct – Substring with at most k distinct characters Posted on August 5, 2019 July 26, 2020 by braindenny Substring with at most k distinct characters If we apply this brute force, it would take O (n 2) to generate all substrings and O (n) to do a check on each one. Given a string, find the length of the longest substring T that contains at most k distinct characters. Example 1: Input: s = "eceba", k = 2 Output: 3 Explanation: T is "ece" which its length is 3. Longest Substring with At Most K Distinct Characters (Hard) Given a string, find the length of the longest substring T that contains at most _k _distinct characters. char c = s.charAt(j); For example, Given s = “eceba” and k = 2, T is "ece" which its length is 3. The implementation below assume that the input string contains only characters from ‘a’ to ‘z’. Longest Substring with At Most K Distinct Characters Given a string s , find the length of the longest substring T that contains at most k distinct characters. So , complexity should be n + (n-1) + (n-2) + …… 1 = O(n^2). Top K Frequent Elements 348. This can be done by just isn’t hashmap. 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. return s.length(); This website contains ALL LeetCode Premium problems for FREE!!. 3)Then using that index value backspace the nearby value using substring()[which has to be separated and merged without # character]. I think it should be o(n^2), because every time we found a char of count less than desired frequency k, we will discard that char and recuse for substring left to it and another recursion for right to it. For example, Given s = "eceba" , k = 3 , T is "eceb" which its length is 4 . The above code resets count array “cnt[]” in every iteration of outer loop. Given a string, find the length of the longest substring T that contains at most k distinct characters. what is the time complexity of this solution ? generate link and share the link here. Longest Substring with At Least K Repeating Characters (Java) LeetCode – Substring with Concatenation of All Words (Java) ... Just create a data structure that acts as a string that doesnt allow more than k distinct elements to be added to it. A simple way is to generate all the substring and check each one whether it has exactly k unique characters or not. Intersection of Two Arrays 350. Longest Substring with At Most K Distinct Characters. 340. Last Updated : 23 May, 2019. All leaked interview problems are collected from Internet. So lets say in one iteration(or first call to recursion we left 1 char and traverse n-1 chars), in next we will again leave 1 char if its freq less than k, and do recursion again for (n-2) chars and so on till only 1 char is left (worst case). 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. Idea Report. By using our site, you Flatten Nested List Iterator 342. When the number of kind is larger than k, we need to move the left side of the window, until the number of kind is no more larger than k. char c = s.charAt(i); Exercise (Further Optimization): Attention reader! For example, Given s = “eceba” and k = 2, T is "ece" which its length is 3. For example, given: s: The problem is very similar to the Leetcode question 3 (Longest Substring Without Repeating Characters). LeetCode / Longest Substring with At Most Two Distinct Characters.java / Jump to. Two pointers With two pointers i and j, we can explore the string using j while marking … Continue reading "[Leetcode]340. Count number of substrings with exactly k distinct characters, Count of substrings of length K with exactly K distinct characters, Find distinct characters in distinct substrings of a string, Count distinct substrings that contain some characters at most k times, Count of Substrings with at least K pairwise Distinct Characters having same Frequency, Count of substrings having all distinct characters, Generate a string of size N whose each substring of size M has exactly K distinct characters, Minimum length substring with exactly K distinct characters, Find the String having each substring with exactly K distinct characters, Count of ungrouped characters after dividing a string into K groups of distinct characters, Count number of distinct substrings of a given length, Replace minimal number of characters to make all characters pair wise distinct, Count number of substrings of a string consisting of same characters, Count of distinct substrings of a string using Suffix Trie, Count of distinct substrings of a string using Suffix Array, Count distinct substrings of a string using Rabin Karp algorithm, Count of Distinct Substrings occurring consecutively in a given String, String with k distinct characters and no same characters adjacent, Count substrings with same first and last characters, Recursive solution to count substrings with same first and last characters, Count of Substrings that can be formed without using the given list of Characters, Count of all unique substrings with non-repeating characters, Count of substrings formed using a given set of characters only, Count of substrings of a given Binary string with all characters same, Count substrings with different first and last characters, Data Structures and Algorithms – Self Paced Course, Ad-Free Experience – GeeksforGeeks Premium, We use cookies to ensure you have the best browsing experience on our website. Longest substring with k increasing characters Leetcode Problem Link: -distinct-characters/ The Problem Given a string s and an integer k, return the length of the longest substring of s that contains at most k distinct characters. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. But we first need to split the input string by using the characters whose occurrence < k. The key idea of the solution is to use two pointers to maintain a "sliding window". For example, Given s = “eceba” and k = 2, acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Amazon Interview Experience for SDE-1 (Full Time-Referral) 2020, Number of substrings with count of each character as k, Program to print all substrings of a given string, Print all subsequences of a string | Iterative Method, Print all subsequences of a string using ArrayList, Generating all possible Subsequences using Recursion, Subarray/Substring vs Subsequence and Programs to Generate them, Find subarray with given sum | Set 1 (Nonnegative Numbers), Find subarray with given sum | Set 2 (Handles Negative Numbers), Find subarray with given sum with negatives allowed in constant space, Smallest subarray with sum greater than a given value, Find maximum average subarray of k length, Count minimum steps to get the given desired array, Number of subsets with product less than k, Find minimum number of merge operations to make an array palindrome, Find the smallest positive integer value that cannot be represented as sum of any subset of a given array, Write a program to reverse an array or string, Write a program to print all permutations of a given string, Check for Balanced Brackets in an expression (well-formedness) using Stack, Array of Strings in C++ (5 Different Ways to Create), Python program to check if a string is palindrome or not, Different methods to reverse a string in C/C++, Check whether two strings are anagram of each other, C Program to Check if a Given String is Palindrome, Write Interview Thus overall it would go O(n*n*n). Please use ide.geeksforgeeks.org, Example: Input: s = "aaabbbccddd", k = 3 Output: 6 Explanation: The longest substring is "aaabbb", as 'a' and 'b' are repeated 3 times. brightness_4 Given a string, find the length of the longest substring T that contains at most 2 distinct characters. Examples: If the length of string is n, then there can be n*(n+1)/2 possible substrings. }. Reverse String 345. HashMap counter = new HashMap(); splitSet.add(c); Idea is to maintain a hash table while generating substring and checking the number of unique characters using that hash table. Longest Substring with At Most K Distinct Characters 341. for(char c: counter.keySet()){ if(counter.get(c)=k, return the length. counter.put(c, counter.get(c)+1); } if(splitSet.contains(c)){ LeetCode Diary 1. LeetCode – Longest Substring with At Least K Repeating Characters (Java), LeetCode – Longest Substring Without Repeating Characters (Java), Longest Substring with At Most K Distinct Characters, Leetcode – Longest Palindromic Substring (Java), LeetCode – Substring with Concatenation of All Words (Java). Problem: 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.It is given that input string can only have lowercase English letters. j++; Longest Substring with At Most K Distinct Characters . Integer Break 344. while(j= 0 and s [j] != s [k]: maxLen = max (k-i, maxLen) # update i: i = j + 1 # update: j = k-1: return max (len (s) -i, maxLen) Example 1:eval(ez_write_tag([[300,250],'programcreek_com-medrectangle-3','ezslot_3',136,'0','0'])); This problem can be solved using DFS. code. Medium. if(i!=j) Longest Substring with At Most K Distinct Characters | Leetcode. Reverse Vowels of a String 346. close, link Longest Substring with At Most K Distinct Characters. This can be very costly for large alphabet size. } } Two Sum; 2. // Given a string, find the length of the longest substring T that contains at most k distinct characters. Code definitions. edit Example 1: Input: s = "eceba", k = 2 Output: 3 Explanation: The substring is "ece" with length 3. Given a string, find the length of the longest substring T that contains at most k distinct characters. int i=0, j=0; HashSet splitSet = new HashSet(); A simple way is to generate all the substring and check each one whether it has exactly k unique characters or not. } Question; Solution; Given a string, find the length of the longest substring T that contains at most k distinct characters. for(int i=0; i