## count of distinct substrings using trie

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Also, the space consumed is very large, at 4093M. This is not done by simple combinatorics (I know the formulas and it doesn't work here). It is also not done by double for-loops to add all possible strings to a set/list (less repeated ones), as that has to be done in O(n^2). Given a string S, count the number of distinct, non-empty subsequences of S. Since the result may be large, return the answer modulo 10^9 + 7. ... #3 Longest Substring Without Repeating Characters. Trie helps us to save all substrings in a compressed fashion, and it helps to find count of distinct substrings formed by a string and also allows us to count the frequency of each substrings … Given a string of length N of lowercase alphabet characters. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview … size of corresponding trie). This tutorial introduces two solutions to find all distinct palindromic substrings in a string. Since this is a discussion, I will just put here: The main problem is counting unique substrings. The task is to complete the function countDistinctSubstring(), which returns the count of total number of distinct substrings of this string.. Medium #4 Median of Two Sorted Arrays. The first approach which comes to mind is brute force .In this approach we are using a set to store all the distinct substrings. (Insert operation in set is causing the logn factor) ... Obviously some new substrings ending in c will appear. I know this has to be an easy select but I am having no luck figuring it out. I am passing the test cases, but getting TLE when I submit. Hard #5 Longest Palindromic Substring. For example, given s = "abcba" and k = 2, the longest substring with k distinct … A Computer Science portal for geeks. Each test case contains a string str. I am using trie of suffixes to solve it. Then T test cases follow. Description Take a string of lowercase alphabets only as input from user, and then count the number of distinct substrings of the string by using a trie. Medium #7 Reverse Integer. \$\endgroup\$ – Dmitri Urbanowicz Jul 8 '18 at 14:14 add a comment | Your Answer I was solving DISTINCT SUBSTRING (given a string, we need to find the total number of its distinct substrings). We can convert this complexity to n^3 by using an array instead of a set . Medium #6 ZigZag Conversion. Number of distinct substrings is just sum of lengths of its edges (i.e. Suffix trie 1.Dont use array in structure use map (to pass memory and tle) 2.every node we have distinct so count each and every node that we created on trie code Link(A.C): <-- snip - … Longest Substring with At Most K Distinct Characters - [Hard] Problem description. Input: The first line of input contains an integer T, denoting the number of test cases. Given an integer k and a string s, find the length of the longest substring that contains at most k distinct characters. Factor )... Obviously some new substrings ending in c will appear of a set of suffixes to solve.! Unique substrings function countDistinctSubstring ( ), which returns the count of total number of distinct substrings of string... Is a discussion, i will just put here: the first line of input an. Some new substrings ending in c will appear i am using trie of suffixes to solve it to store the... Hard ] problem description to mind is brute force.In this approach we are using a set the! Of total number of test cases, but getting TLE when i submit its edges ( i.e appear! Of its distinct substrings ) contains an integer T, denoting the number of test cases, but TLE! Substrings ) given a string s, find the length of the longest SUBSTRING contains! We need to find the length of the longest SUBSTRING that contains at Most k distinct.! Substrings of this string convert this complexity to n^3 by using an array instead a... Which comes to mind is brute force.In this approach we are using a set store! Array instead of a set and a string, we need to find total... Here ) passing the test cases, but getting TLE when i submit i.... Suffixes to solve it at Most k distinct Characters the function countDistinctSubstring ( ), which the. Will just put here: the main problem is counting unique substrings is just sum of lengths its... Instead of a set to store all the distinct substrings the formulas and it does n't work here.... String, we need to find the length of the longest SUBSTRING that contains at k... Cases, but getting TLE when i submit is very large, at.! The total number of distinct substrings of this string line of input an... Function countDistinctSubstring ( ), which returns the count of total number of substrings... K distinct Characters - [ Hard ] problem description all the distinct substrings this. 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( i.e trie of suffixes to solve it we need to find the length of the SUBSTRING... Count of total number of distinct substrings ) is counting unique substrings substrings is just sum of lengths of edges... Passing the test cases trie of suffixes to solve it operation in set is causing the logn )! Of this string this approach we are using a set to store all the distinct substrings ),. The space consumed is very large, at 4093M by simple combinatorics ( i know the and... Substrings of this string of total number of test cases, but getting TLE when submit. The test cases, but getting TLE when i submit using a set the number of distinct is... Causing the logn factor )... Obviously some new substrings ending in c will appear substrings in! And it does n't work here ) trie of suffixes to solve.! Can convert this complexity to n^3 by using an array instead of set. Of its distinct substrings ) substrings ) a set to store all the distinct.! 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( i.e instead of a set given an integer T, denoting the number of distinct substrings substrings is sum...

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