String compression geeksforgeeks. Intuitions, example walk through, and complexity analysis.
String compression geeksforgeeks. Jul 26, 2025 · A trie is a data structure that stores strings like a tree data structure. Here we discuss find by path compression, where it is slightly modified to work faster than the original method as we Jul 23, 2025 · In simple terms, string methods in Pandas are a set of tools that help us manipulate and work with text (also known as strings) in our data. Example: Jul 11, 2025 · Huffman Coding is a lossless data compression algorithm where each character in the data is assigned a variable length prefix code. It’s important to note that Linux/Unix commands are case-sensitive. Jul 19, 2023 · LeetCode # 443: String Compression — Python Solution Introduction: We are going to explore a common solution for this “String Compression” problem. Sep 5, 2025 · I had applied for the position of Compliance Software Engineer at Goldman Sachs and got a response in two weeks with a preliminary online assessment to be cleared. This algorithm makes sure that the most common characters are represented by shorter bit strings, reducing the overall size of the Mar 26, 2020 · With the help of bz2. In C++, a stream/sequence of characters is stored in a char array. Examples: Input: str = "ababcababcd" Output: ab*c*d Explanation: The substring "ababc" starting Aug 21, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Aug 5, 2025 · Using JavaScript loops We can solve this problem by iterating through the string and count consecutive characters using the JavaScript loop and append the corresponding count and the character to a new string. Mar 6, 2020 · With the help of gzip. Compression helps in decreasing the amount of downloadable data in our NodeJS application, and it leads to an improvement in the performance of the application. Mar 7, 2025 · The gzip command in Linux is a vital tool for compressing files and reducing their sizes. Example #1 : In this example we can see that by using gzip. Examples: Input: S = "GeeksforGeeks" Output Dec 29, 2021 · Given string str of size N containing only lowercase English letters. It is useful in areas like text search, data analysis and more. We will discuss key points on strings as well different types of questions based on that. Using encode () encode () method is a very straightforward Learn about the factors that affect the trade-offs between speed and compression ratio in string algorithms, and some of the common methods for data compression. In this article, we will learn how to zip and unzip files using the Java Programming Language. Jul 12, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. String Compression Description: Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. The value returned by the COMPRESS () function is a binary string. Example: The below code will explain the use of JavaScript loops to compress a string. Here the Daily problem Solution will appear of Leetcode as well as GFG . Run-length encoding is a string compression method that works by replacing consecutive identical characters (repeated 2 or more times) with the concatenation of the character and the number marking the count of the characters (length of the run). Ordinarily, a string of characters, for example, the words "hey" is represented for utilizing a fixed number of bits per character. There Exist several compression Algorithms, but we are concentrating on LZW. Why BWT? The main idea behind it. What is Huffman Coding? Huffman Coding is a lossless data compression algorithm. Feb 17, 2021 · The MySQL UNCOMPRESSED_LENGTH () function returns NULL if the compressed string is a NULL string. What is Huffman Coding? Huffman Coding is an approach used in lossless data compression with the primary objective of delivering reduced transit size without any loss of meaningful data content. I just want to introduce the sponsor. How to build a Suffix Tree for a given text? As discussed above, Suffix Tree is compressed trie of all suffixes, so following are very abstract steps to build a suffix tree from given Jun 1, 2022 · Arithmetic coding is a type of entropy encoding utilized in lossless data compression. Decoder using getDecoder () and then decoded the string passed in decode () method as parameter then convert return value to string. Please Leave star to motivate me . These commands are used for tasks like file handling, process management, user administration, networking, and system monitoring. Jul 23, 2025 · Efficient storage of data: Bitwise algorithms play a crucial role in data compression techniques like Huffman coding. Jul 15, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Many String Problems can Oct 10, 2024 · HTTP compression is concerned with the application of different algorithms to the amount of data that has to be sent out from the server, the amount of data that has to come to the client in order to make further relations as efficient as possible. Apr 23, 2025 · Given a string str and an integer k, the task is to reduce the string by applying the following operation any number of times until it is no longer possible: Choose a group of k consecutive identical characters and remove them from the string. com/problems/string-compression/443. Data encryption standard (DES) has been found vulnerable to very powerful attacks and therefore, it was replaced by Advanced Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. ​Example 2: Input: S = "aaacca" Output Aug 14, 2025 · Technically, it is a lexicographical reversible permutation of the characters of a string. A null argument is treated as a string that features a length of zero. Mar 18, 2023 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. In this article, We will understand the process of disk compression, the uses of disk compression, and more. Examples: Input : str = 'wwwxxxwww' Output : 'w3x3w3' This problem has existing solution please refer Run Length Encoding link. These classes provide useful methods that can be used for compressing the file content. There is a key rule that lies This is our 1st Video on our String PlaylistIn this video we will try to solve a very interesting Problem : "String Compression". It is mostly beneficial when it comes to documents like HTML or CSS and JavaScript texts but mostly avoided when it comes to media files like May 18, 2012 · I need to create a method that receives a String and also returns a String. We mainly find representative of both and check Jul 23, 2025 · Use a hash function to convert long string to short string. The questions were of an easy level, one of which was - String compression. String Compression || Top Interview Problem || Medium level || Python Nov 26, 2022 · The java. Jul 26, 2025 · Explanation: In the above code, we first create a StringBuilder with the object sb and put the initial string as "GeeksforGeeks" Then we use the append () method from StringBuilder class to add the " is awesome!" string in end of current StringBuilder object. All right, guys, before we start our video today. Example #1 : In this example we can see that by using lzma. Mostly zip and unzip files are used for zip the files for save storage, easy to share, and other purposes. Suppose you want to square every number in a list: Jul 23, 2025 · In this article, we will learn the implementation of Huffman Coding in C. Jul 23, 2025 · Given two strings, S and T where S is a normal string and T is a compressed string, the task is to determine if the compressed string T can be achieved by compressing the string S. compress(s) method, we can get compress the bytes of string by using zlib. By default, compression. String Compression - Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. Given two strings, S and T where S is a normal string and T is a compressed string, determine if the compressed string T is valid for the plaintext string S. Syntax : zlib. By 'symmetric', we mean that the size of input text and output text (ciphertext) is same (64-bits). Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The nodes of a compressed trie can be stored by storing index ranges at the nodes. Aug 14, 2024 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Compress the string when lower and upper cases are the same. Decoders (or Mar 2, 2023 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. In other words, it removes leading, between and trailing spaces from the strings. It is first of the three steps to be performed in succession while implementing the Burrows-Wheeler Data Compression algorithm that forms the basis of the Unix compression utility bzip2. Note: If two strings are equal, their hash values should also be equal. It helps you write clean, readable and efficient code compared to traditional loops. The maximum number of children in a node is equal to the size of the alphabet. Finally, all combined strings in the list ans are joined together into a single string without any delimiter (since the length of each string is encoded at the beginning of each segment), and this string is returned. Below programs illustrate the Encoding and Decoding in Java: Program 1: Encode simple String into Basic Base 64 format Oct 12, 2021 · Suppose we have a string s. What is Huffman Coding? Huffman Coding is a popular algorithm used for lossless data compression. You may assume that the input string is always valid; there are no extra white spaces, square brackets Jul 22, 2021 · This article explains how one can perform various operations on a zip file using a simple python program. util. Sep 10, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The following facts make string an interesting data structure. A dictionary comprehension takes the form {key: value for (key, value) in iterable} Python Dictionary Comprehension Example Here we have two lists named keys and value and we are iterating over them with the help of zip () function. Solve company interview questions and improve your coding intellect Sep 16, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The function returns the number of bytes of the compressed data. Note: If the string can be encrypted in multiple ways, find the smallest encrypted string. decompress(s) method, we can decompress the compressed bytes of string into original string by using gzip. decompress(s) method, we are able to decompress the compressed string in the byte format of string by using this method. Our question again is on leak code as always, our questions from Amazon and it’s called string progression. This article aims at diving deep into the Huffman Coding and its implementation in Python. LZMACompressor() method, we can get compressor to compress the bytes of string by using lzma. C++ includes the std::string class that is used to represent strings. Jul 28, 2022 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Compression reduces the cost of storage, increases the speed of algorithms, and reduces the transmission cost. LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Example: Input: Output: Graph contains Cycle. Jul 11, 2025 · String actualString= new String (actualByte); Explanation: In above code we called Base64. Jul 11, 2025 · Data Encryption Standard (DES) is a symmetric block cipher. May 2, 2024 · Embark on a journey through string manipulation and algorithmic analysis with this insightful guide from GeeksforGeeks. ASCII has only 256 characters. Count the number of subsequent A special compression mechanism can arbitrarily delete 0 or more characters and replace them with the deleted character count. Before understanding this article, you should have basic idea about Huffman encoding . zip package provides classes compress and decompress the file contents. LZMACompressor() method, we are able to compress the string in the byte format by using this method. So, if the input is like s = "abbbaaaaaaccdaaab", then the output will be Jul 24, 2025 · Two sets are called disjoint sets if they don't have any element in common. decompress(s) method. Jul 25, 2024 · Like List Comprehension, Python allows dictionary comprehensions. For example, searching for the word "apple" in a paragraph. Online assessment There were 2 coding questions to be solved on the GeeksforGeeks platform. LZMACompressor() Return : Return compressed string. Jul 23, 2025 · Given a string S, the task is to find the length of the shortest compressed string. zip is used to compress the input data and fill the given buffer with the compressed data. Ex input: AAABBBBCC Ex output: 3A4B2C Well, this is quite embarrassing and I couldn't manage to do it on the intervie Mar 6, 2020 · With the help of zlib. You are given two strings s1 and s2 and your task is to compare them on the basis of the given priority order. Mastering these concepts can help you effectively tackle Day 60 of #100DayOfCodingChallenge: String Compression ( LEETCODE || Problem 443. For each group of consecutive repeating characters in chars: If the group's length is 1, append the character to s. This null character marks the end of the string and is essential for proper string manipulation. Finding representative of a disjoint set using Find operation. Conceptual questions based on Huffman Encoding - Here are the few key points based on Huffman Encoding Aug 6, 2025 · In Java Programming we have a lot of features available for solving real-time problems. In the simplest approach, we iterate through the string, track Jul 23, 2025 · Huffman Coding is one of the most popular lossless data compression techniques. Note: A compression mechanism can arbitrarily delete X (X >= 0) characters and replace them with the deleted character count (X). Gzip is the most widely used compression, especially for server and client interactions. The 'block' here means that it takes group of bits together as input instead of encrypting the text bit by bit. Example: Input: " Geeks For Geeks " Output: "Geeksforgeeks" Input: null Output: null Syntax Apr 28, 2025 · 2. * Otherwise, append the character followed by the group's length. When applying Huffman encoding technique on an Image, the source symbols can be either pixel intensities of the Image, or the output of an intensity mapping function. We can create dictionaries using simple expressions. This is essential for working with binary data or when encoding strings for storage or transmission. FileInputStream, FileOutputStream, and GZIPOutputStream classes are provided in Java to compress and decompress the files. Jul 23, 2025 · It typically works by locating similar strings/characters within a text file and replacing them with a temporary binary representation to reduce the overall file size. compress(s) method, we can get compress the bytes of string by using gzip. There are two types of string matching algorithms: Exact String Matching Algorithms Approximate String Matching Algorithms To understand more about matching algorithms refer to: String Matching Huffman Coding is a technique of compressing data so as to reduce its size without losing any of the details. Mar 6, 2020 · With the help of zlib. Mar 2, 2023 · Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. -String-Compression Write a function that compresses a string such that consecutive duplicate characters are replaced by the character followed by its count. Established a set (2-3) of test cases to verify their own solution later Jun 27, 2024 · The Huffman coding is a popular algorithm used for lossless data compression. Whether you’re a Linux system administrator or a beginner, understanding how to use gzip for file compression is essential. Syntax : gzip. in/dJ38VA9N Given an array of characters chars, compress it using the following algorithm: Begin Jul 11, 2025 · Huffman coding is one of the basic compression methods, that have proven useful in image and video compression standards. Create algorithms to encode strings into a single encoded string for transmission and decode them back to the original array. Prerequisites: Disjoint Set (Or Union-Find), Union By Rank and Path Compression We have already discussed union-find to detect cycle. They can efficiently represent and process compressed data by manipulating bits directly. If the compressed string is not shorter than the original, return the original string. Properties of Trie: It's a multi-way tree. The task is to encrypt the string such that the substrings having same prefix as itself are replaced by a *. This comprehensive guide will dive deep into various string compression and encoding techniques, their implementations, and their applications in real-world scenarios. Apr 27, 2023 · A special compression mechanism can arbitrarily delete 0 or more characters and replace them with the deleted character count. It is one of the most fundamental datatypes in C++ and it comes with a huge set of inbuilt functions. Append the picked character to the destination string. Jul 11, 2025 · The Boost String Algorithms Library provides a generic implementation of string-related algorithms which are missing in STL. Jan 25, 2023 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Jul 15, 2025 · String matching is a process of finding a smaller string inside a larger text. The receiver then retrieves full information by decompressing the object which is compressed by the sender. String Compression in Python, Java, C++ and more. Instead, strings are implemented as arrays of char. Stream Handling : Quickly compress or decompress files, buffers, or streams using popular algorithms like Gzip and Deflate. The variable-length codes assigned to input characters are Prefix Codes, means the codes (bit sequences) are assigned in such a way that the code assigned to one character is not the Jul 23, 2025 · In this article, we will learn the implementation of Huffman Coding in C++. In compressed string characters should be in lowercase. One of the features of the std::string class is the shrink_to_fit () function, which allows developers to reduce the amount of memory allocated for a string to the minimal amount needed to store its current Aug 27, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. However, GZIP is not a zip tool, it only use to compress a file into a ". It means Aug 3, 2022 · String is an important topic from GATE exam point of view. - Created using [GfG To GitHub]( Jul 23, 2025 · If we have a string where the complete string is repetition except one substring, then we can use this algorithm to compress the string. The other question was an ad-hoc problem on a 2D matrix, which Jul 29, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. type is set to the producer in the broker configuration. It accepts one parameter which is the compressed string whose length needs to be calculated. Pandas, which is a powerful Python library for data manipulation, provides a variety of built-in tools to make that job easier. What is a zip file? ZIP is an archive file format that supports lossless data compression. One can easily print letters in alphabetical order which isn't possible with hashing. Present in FileInputStream. compress(string) Return : Return compressed string. Data Compression: Strings can be compressed to reduce the amount of storage required to store them. compress(s) method, we are able to compress the string in the byte format by using this method. Share your learnings on Link Jul 23, 2025 · Given a string S of length N, the task is to find the SHA-512 Hash Value of the given string S. The least frequent character gets the largest code and the most frequent one gets the smallest code. There are two ways to store strings as character array (char p [20]) or a pointer pointing to a string (char* s = “string”), both of which can be accessed as arrays. It is used on a string that has been compressed using the COMPRESSED () function. Mar 26, 2020 · With the help of lzma. Apr 28, 2025 · Given a string str of length n, your task is to find its hash value using polynomial rolling hash function. Jul 12, 2025 · Python’s Itertool is a module that provides various functions that work on iterators to produce complex iterators. Compression is achieved by removing redundancy, that is repetition of unnecessary data. It is also used as the basis for other Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Otherwise, append the character followed by the group's length. This technique ensures that the most common characters are represented by shorter bit strings, reducing the Feb 17, 2021 · The MySQL UNCOMPRESS () function is used for uncompressing a string and bring it back to its original state. Type 1. compress(s) method. Each leaf node corresponds to the stored string, which is a chain of Jul 12, 2025 · COMPRESS function is basically used to compress/removes all the spaces/blanks in a character string. For example, given the string "Hello", these methods can convert it into a byte representation like b'Hello'. Jul 12, 2025 · Given a string str consisting of lowercase and uppercase characters, the task is to find the minimum possible length the string can be reduced to after performing the given operation any number of times. Understanding what disk compression entails and how it works can help manage rising data needs. Apr 27, 2023 · Object Compression is the process of reducing the size of the object with the help of various classes and methods. StringBuilder StringBuilder Constructors The StringBuilder class provides several constructors, which are listed below: Example Sep 2, 2025 · List comprehension is a concise and powerful way to create new lists by applying an expression to each item in an existing iterable (like a list, tuple or range). So, a ZIP file is a single file containing one or more Platform to practice programming problems. Unlike normal array, strings typically have smaller set of items. All of them come in different variants so it is easier to choose the best fit for a particular need. Jan 27, 2023 · The C++ Standard Template Library (STL) provides a variety of useful classes and functions for working with data structures, including the std::string class for manipulating strings. Small set of elements. Jul 23, 2025 · One would have noticed that many compression packages are used to compress files. compress(s) method, we can get compress the bytes of string by using bz2. Example 1: Input: S = "aaABBb" Output: "3a3b" Explanation: As 'a' appears 3 times consecutively and 'b' also 3 times, and 'b' and 'B' considered as same. We have to compress this string into Run length encoding form. Jul 11, 2025 · The goal here is to convert a string into bytes in Python. Rooftop, slushy rooftop slushy is a product that offers an entire suite of services to make Sep 16, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Strings are immutable in programming languages like Java, Python, JavaScript and C#. It supports following operations: Merging two disjoint sets to a single set using Union operation. The compressed string s should not be returned separately, but instead, be stored in the input character Aug 7, 2024 · Image Source: Wikipedia Using python to encode strings: In Python the base64 module is used to encode and decode data. ) https://lnkd. Aug 8, 2025 · Compress Trie is obtained from standard trie by joining chains of single nodes. Each node has from 1 to N children. Generate the encrypted string. String compression and encoding algorithms play a vital role in achieving these goals by reducing the size of data without losing essential information. Prerequisites: Java Jul 25, 2025 · A string is an array of characters terminated by a special character '\0' (null character). Jul 23, 2025 · Features Easy Compression and Decompression : The zlib module allows you to compress and decompress files, buffers, or streams with various compression algorithms, such as Gzip and Deflate. This terminal is similar to the command prompt in Windows. Understanding key algorithms like pattern matching and edit distance is crucial. Nov 26, 2024 · Given an input string, write a function that returns the Run Length Encoded string for the input string. For single characters we shall not add the count into it. Dec 28, 2024 · Huffman Encoding is an important topic from GATE point of view and different types of questions are asked from this topic. decompress(string) Return : Return decompressed string. So when a character is repeated k number of times consecutively like 'bbbb' here letter 'b' is repeated four times consecutively, so the encoded form will be 'b4'. Sep 14, 2023 · The java. Let’s explore different methods to accomplish this efficiently. It works by assigning the variable-length codes to the input characters with the shorter codes assigned to the more frequent characters. Aug 27, 2016 · The 4-character length is then concatenated with the actual string, and this combined string is added to a list (ans). This results in the prefix-free code meaning no code is a prefix of any other code. The COMPRESS () function stores non-empty strings as a four-byte length of the uncompressed string, which is then followed by the compressed string. The idea is to assign variable-length codes to input characters, lengths of the assigned codes are based on the frequencies of corresponding characters. Data compression reduces the number of resources required to store and transmit data. Syntax : bz2. For each group of consecutive repeating characters in chars: * If the group's length is 1, append the character to s. decompress(s) method, we can decompress the compressed bytes of string into original string by using zlib. Jun 24, 2019 · The deflate () function of the Deflater class in java. FileInputStream, FileOutputStream and GZIPOutputStream classes are provided in Java to compress and decompress the files. " How’s it going guys today? We’re going to be going over another interview. It assigns variable-length codes to input characters, with shorter codes assigned to more frequent characters. It is an extension to the algorithms library of STL and it includes trimming, case conversion, predicates and find/replace functions. It employs the DEFLATE compression algorithm , which makes it highly effective for compressing large files or preparing data for transfer over networks. For example, if the input string is 'wwwwaaadexxxxxx', then the function should return 'w4a3d1e1x6'. In hashing, that may be collisions (2 long URLs map to same short URL) and we need a unique short URL for every long URL so that we can access long URL back. Broker-Level Kafka Compression The broker receives the compressed batch from the client and writes it straight to the topic's log file without re-compressing the data if the destination topic's compression configuration is set to compression. It can be done in two ways- lossless compression and lossy compression. There are two types of file compression, Lossy compression: Lossy compression shrinks a file by permanently removing certain elements, particularly redundant elements. Jun 2, 2022 · String Compression using python Asked 3 years ago Modified 1 year, 8 months ago Viewed 4k times May 13, 2025 · Java programming exercises and solution: Write a Java program to create a basic string compression method using repeated character counts. The MySQL UNCOMPRESS () function returns empty strings if the compressed string is an empty string. Here I will explain how to Zip files and How to Unzip files by using Java Programming. Dec 14, 2022 · Check whether a given graph contains a cycle or not. type=producer. In the most straightforward case, the probability of every symbol occurring is equivalent. Jul 23, 2025 · Lossy compression methods include DCT (Discrete Cosine Transform), Vector Quantisation, and Transform Coding while Lossless compression methods include RLE (Run Length Encoding), string-table compression, LZW (Lempel Ziff Welch), and zlib. If the topic has its own compression option (for Problem Highlights 🔗 Geeksforgeeks Link: Run Length Encoding 💡 Difficulty: Medium ⏰ Time to complete: 20 mins 🛠️ Topics: Array 🗒️ Similar Questions: String Compression, Count and Say ## 1: U-nderstand Understand what the interviewer is asking for by using test cases and questions about the problem. Note: For more information, refer to Python Itertools Compress () The itertools. Compressing a File using GZIPOutputStream Methods used in the program read (): Reads a byte of data. Data Compression Techniques Data compression can be divided into two categories: lossless and lossy. Questions often focus on string manipulation techniques such as searching, concatenation, reversal, and substring extraction. Mar 2, 2023 · question link : https://leetcode. Examples: Jul 23, 2025 · Pattern Matching: Strings can be searched for patterns, such as regular expressions or specific sub-strings, to extract or process data in a specific way. The disjoint set data structure is used to store such sets. For instance, think about a set of three symbols, A, B, and C, each similarly prone to String Compression using count of repeated characters - Run Length Encoding Objective: Write an algorithm to compress the given string by using the count of repeated characters and if new compressed string length is not smaller than the original string then return the original string. For example, lowercase English alphabet has only 26 characters. Examples: Input: s = "aaaaabbbbbb" Output: ab Explanation: Remove consecutive duplicate characters from a string s such as 5 a's are at consecative so only write a and same like that in b's condition. It plays a critical role in Aug 26, 2025 · Example: String str = new String (“GeeksforGeeks”); Interfaces and Classes in Strings in Java CharSequence Interface CharSequence Interface is used for representing the sequence of Characters in Java. One observation is, length of string must be a multiple of k as we can replace only one substring. . Jul 23, 2025 · Disk compression refers to the process of encoding data on disk drives in a compact form that reduces storage volume requirements. zip package provides classes to compress and decompress the file contents. Jan 30, 2024 · Understand what is a string compression leetcode problem and ho to solve it with implementation in C++, Java, and Python. Jul 18, 2024 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. This repository serves as a collection of my solutions to various GeeksforGeeks Data Structures and Algorithms (DSA) problems, organized by the level of difficulty. Can you solve this real interview question? Decode String - Given an encoded string, return its decoded string. Syntax : lzma. The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. The Huffman coding guarantees an optimal prefix-free encoding minimizing the total number of bits Mar 26, 2020 · With the help of bz2. For example, if the input string is "wwwwaaadexxxxxx", then the function should return "w4a3d1e1x6" Follow the steps below to solve this problem: Pick the first character from the source string. Note that k is guaranteed to be a positive integer. The below example shows the implementation of encoding strings isn't base64 characters. Encoding the data using this technique is very easy and efficient. Jul 12, 2025 · Linux commands are essential for controlling and managing the system through the terminal. Prerequisites : Huffman Coding | File Handling The first step of Huffman coding technique is to reduce the Sep 11, 2023 · DeflaterOutputStream and InflaterInputStream classes are provided in Java to compress and decompress the file contents. In the given C++ implementation, the time complexity is dominated by the creation of the Huffman tree using the priority queue, which takes O (n log n) time. Example #1 : In this example we can see that by using bz2. Discover the principles behind Mar 17, 2024 · Given a string str and an integer K, the task is to reduce the string by applying the following operation any number of times until it is no longer possible: Finally, print the reduced string. First, the strings are converted into byte-like objects and then encoded using the base64 module. Note: Function must return 0 if both the strings are equal, 1 if s1 is greater than s2, and -1 if s1 is lesser than s2. Intuitions, example walk through, and complexity analysis. By lossless compression, we mean that the compression algorithm allows the original data to be perfectly reconstructed from the compressed data. Jul 23, 2025 · Strings are essential data structures used to represent sequences of characters and are frequently encountered in coding interviews. gz" format, not compress Jul 23, 2025 · Compression techniques are useful for reducing file sizes for storage, minimizing bandwidth during transmission and enabling faster uploading/downloading of web content over the internet. Aug 31, 2025 · A string is a sequence of characters. Jul 23, 2025 · Given a compressed string composed of lowercase characters and numbers, the task is to decode the compressed string and to find out the character located at the Kth position in the uncompressed string, You can transform the string by following the rule that when you encounter a numeric value "n", repeat the preceding substring starting from index 0 'n' times Examples: Input: S = "ab2c3" K = 10 Jul 23, 2025 · Huffman coding is a lossless data compression algorithm. Check if two elements belong to same set or not. Here’s a list of A to Z Linux commands Jan 3, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The GZIPOutputStream class is useful for writing compressed data in GZIP file format. Input: Output: Graph does not contain Cycle. compress() falls under the category of terminating iterators. This module works as a fast, memory-efficient tool that is used either by themselves or in combination to form iterator algebra. LZMACompressor() method. Compressing a File using DeflaterOutputStream This class implements an output stream filter for compressing data in the "deflate" compression format. Apr 7, 2023 · The auxiliary space complexity is also O (n), where n is the number of characters in the input string. Unlike many modern languages, C does not have a built-in string data type. The string can be compressed in the following way: If S = "ABCDABCD", then the string can be compressed as (ABCD)2, so the length of the compressed string will be 4. Jul 23, 2025 · A string is referred to as an array of characters. In-depth solution and explanation for LeetCode 443. However, decoding the bitstream generated using this technique is inefficient. The implementation is not restricted Apr 9, 2024 · DATA COMPRESSION AND ITS TYPES Data Compression, also known as source coding, is the process of encoding or converting data in such a way that it consumes less memory space. Question together today. These are the types of questions asked in GATE based on Huffman Encoding. In this article, will look at the functions of string computations. We have given an array of chars, and we You are given the string S . In this tutorial, you will understand the working of Huffman coding with working code in C, C++, Java, and Python. Jul 23, 2025 · Given an input string, write a function that returns the Run Length Encoded string for the input string. In this illuminating article, you'll explore the task of determining if two given strings are isomorphic to each other—an essential problem in string processing with applications in cryptography, data compression, and algorithmic design. Example #1 : In this example we can see that by using zlib. Better than official and forum solutions. If the string ends with space, a ". Take a look at below figure to distinguish the size of the file before compressing and the size of the file after compressing: Need for Object Compression Java object May 11, 2025 · Given a string s , The task is to remove all the consecutive duplicate characters of the string and return the resultant string. The COMPRESS function allows null arguments. Jun 20, 2024 · We can use the compression module in order to do compression with Gzip compression. Nov 30, 2022 · The MySQL COMPRESS () function is used for the compression of a string. Valid Compressed String | Easiest Solution💥😃Problem of the Day #geeksforgeeks #leetcode CODE with Rahul. Jan 28, 2019 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. int read() write (): Writes a byte of data, Present in Mar 23, 2020 · With the help of gzip. cfdbk yceq mon hzhw skb vwzexu pgwp ncqjayh skiplzq xwmunye