The first approach which comes to mind is brute force .In this approach we are using a set to store all the distinct substrings. ... #3 Longest Substring Without Repeating Characters. This is not done by simple combinatorics (I know the formulas and it doesn't work here). (Insert operation in set is causing the logn factor) ... Obviously some new substrings ending in c will appear. 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 - … size of corresponding trie). I am passing the test cases, but getting TLE when I submit. Then T test cases follow. Since this is a discussion, I will just put here: The main problem is counting unique substrings. Medium #7 Reverse Integer. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview … Given a string of length N of lowercase alphabet characters. Medium #6 ZigZag Conversion. Input: The first line of input contains an integer T, denoting the number of test cases. This tutorial introduces two solutions to find all distinct palindromic substrings in a string. Also, the space consumed is very large, at 4093M. 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). I am using trie of suffixes to solve it. 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. Number of distinct substrings is just sum of lengths of its edges (i.e. A Computer Science portal for geeks. I was solving DISTINCT SUBSTRING (given a string, we need to find the total number of its distinct 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. Hard #5 Longest Palindromic Substring. For example, given s = "abcba" and k = 2, the longest substring with k distinct … I know this has to be an easy select but I am having no luck figuring it out. Medium #4 Median of Two Sorted Arrays. The task is to complete the function countDistinctSubstring(), which returns the count of total number of distinct substrings of this string.. We can convert this complexity to n^3 by using an array instead of a set . 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