Find all unique substrings in a string java Can you solve this real interview question? Find Unique Binary String - Given an array of strings nums containing n unique binary strings each of length n, return a binary string of length n that does not appear in nums. A string is a palindrome when it reads the same backward as forward. Examples: Input : "AABBBCBB" Output : 5 Input : "AABBBCBBAC" Output : 3 Explanation : Sub-string -> "BAC" Input : "GEEKSGEEKSFOR" Output : 8 Explanation : Sub-string -> "GEEKSFOR" Method 1 (Brute Force) We can consider all sub-strings one . You can split string s into any list of non-empty substrings, where the concatenation of the substrings forms the original string. In this blog post, we'll explore the various ways to find substrings in Java, including built - in methods, common practices, and best practices. Example: Input: "stackoverflow" Output: "stackoverfl" If there are two such candidates, return first from left Mar 10, 2024 · Problem Formulation: The task is to identify all unique substrings within a provided string that read the same backwards as forwards, known as palindromes. Every substring is composed with only unique letters. In this video, you'll learn how to count occurrences of a substring within a string in Java using three different approaches: a traditional loop, Java 8 Streams, and a HashMap for substring Mar 3, 2024 · It starts with an empty set substr_set, where it stores each substring to ensure that all substrings are unique. I can think of an O (n*n) algorithm which considers all the substrings of a given string and calculates the number of non-repeating characters. The trick is that the least ending index increases over the course of the function, so with a little data structure support, we consider each character at most twice. For example: Finding the longest palindromic substring. If there are multiple answers, you may return any of them. Jun 28, 2012 · How do you find the shortest substring of each element in an array of strings where the substring is NOT contained within any of the other elements, ignoring case? May 21, 2025 · Write a Java program to find the longest substring in a string that contains all unique characters. Can you solve this real interview question? Longest Substring Without Repeating Characters - Given a string s, find the length of the longest substring without duplicate characters. Thus, all duplicate substrings will be discarded as a hash set always containing the unique elements. Use a for loop to iterate through the characters of the original string, starting from the first character. What is a substring? According to Wikipedia, The contiguous sequence of characters within a String is called substring. It produces a Stream of MatchResult objects which correspond to captured substrings, and the only thing needed is to apply Stream. Length of this substring is 2. Oct 15, 2025 · Find all palindrome substrings of a string with efficient algorithms. Examples: Input: S = "abaaba" Output: 2 Explanation: The smallest substring in the string S, whose occurrence is exactly 1 is "aa" . Sep 9, 2025 · Given a string and a positive integer `k`, find all distinct substrings of any length containing exactly `k` distinct characters. But how would you "Generate all unique substrings for given string" with a suffix array/longest common prefix array? Jul 12, 2025 · Approach: The idea is to iterate over all the substrings. It takes user input example: "abbaalla" it loops through creating a substring that changes as the loop progresses. Jul 23, 2025 · The idea to count the occurrence of the string in the string and print if count equals one Extract words from string using split () method and store them in an array. Think of it as using scissors to cut out exactly the piece of text you need. You may return the answer in any order. Feb 14, 2012 · Possible Duplicate: How to see if a substring exists inside another string in Java 1. Jan 12, 2021 · In this post, we will see java program to find all substrings of a String. " is a string with 19 characters. In the end return this count as count of all unique substrings with non-repeating characters. The naive approach would be to check every possible substring of length len(p) in s, but this would involve repeatedly counting characters for overlapping windows. Sum of lengths of all substring is 1 + 1 + 1 + 2 + 2 + 3 = 10 Example 2: Input: s = "ABA" Output: 8 Explanation: The same as example 1, except countUniqueChars ("ABA") = 1. Example The Jan 8, 2024 · In this tutorial, compare ways to find the longest substring of unique letters using Java. Dec 5, 2022 · Hello. Jul 11, 2025 · Number of substrings of length one is n (We can choose any of the n characters) Number of substrings of length two is n-1 (We can choose any of the n-1 pairs formed by adjacent) All we need to do is to generate all of the substrings of the given string using nested for-loops and the substring () method. nwlws yjy txaur cfzuis zvgxdrf eqx qkyl hcdxw nflqej yadxlb cqq ttgnrjaw pezag gmrqc dguunq