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. For example, given s = "abcba" and k = 2, the longest substring with k distinct … size of corresponding trie). (Insert operation in set is causing the logn factor) ... Obviously some new substrings ending in c will appear. Input: The first line of input contains an integer T, denoting the number of test cases. Each test case contains a string str. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview … The task is to complete the function countDistinctSubstring(), which returns the count of total number of distinct substrings of this string.. Number of distinct substrings is just sum of lengths of its edges (i.e. Also, the space consumed is very large, at 4093M. Hard #5 Longest Palindromic Substring. 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 … 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. This tutorial introduces two solutions to find all distinct palindromic substrings in a string. I was solving DISTINCT SUBSTRING (given a string, we need to find the total number of its distinct substrings). Medium #6 ZigZag Conversion. This is not done by simple combinatorics (I know the formulas and it doesn't work here). 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 - … ... #3 Longest Substring Without Repeating Characters. $\endgroup$ – Dmitri Urbanowicz Jul 8 '18 at 14:14 add a comment | Your Answer 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). Longest Substring with At Most K Distinct Characters - [Hard] Problem description. A Computer Science portal for geeks. Medium #7 Reverse Integer. Given an integer k and a string s, find the length of the longest substring that contains at most k distinct characters. I am using trie of suffixes to solve it. Medium #4 Median of Two Sorted Arrays. Given a string of length N of lowercase alphabet characters. Then T test cases follow. I know this has to be an easy select but I am having no luck figuring it out. 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