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C++ Articles
Page 76 of 597
Queries to search an element in an array and move it to front after every query
Introduction In this tutorial, the task is to use queries to search for an element in an array. It is to push to the front after every query in C++. To implement this task, it takes an array A with elements from 1 to 5 and a query array Q for finding the element in A and moving it to the front of the array. The output is the index number of the searched elements. We use two methods for moving array elements to the front as per the query array. Naive Approach − Iterate through the array of ...
Read MoreHow to Process strings using std::istringstream?
Introduction In this tutorial, we will learn about the istringstream and how to use it for processing strings. istringstream is an object of string class defined in the header file. It is used for reading from the stream strings. A stream is a flow of data (collection of characters) between input-output devices and programs. The header file defines 3 string class objects, which are as follows − istringstream ostringstream Stringstream All are used for separate operations, like istringstream is responsible for stream input, ostringstream is for stream output, and stringstream handles both input and output of ...
Read MoreLongest subsequence with different adjacent characters
Introduction In this tutorial, we implement an approach to find the longest subsequence with different adjacent characters. Here, the longest subsequence is a subsequence that contains the maximum number of string characters with different adjacent characters. To implement the approach to finding the longest subsequence, consider a string s, and iterate We use two approaches to resolve the problem statement of finding the longest subsequence having different adjacent characters. Greedy ApproachIt is one of the most used algorithms to solve the data structure problem. This approach tries all possible cases and chooses the most suitable. Dynamic programmingIt ...
Read MoreHow to validate image file extension using Regular Expression?
Introduction In this article, we check validate image file extension using regular expressions. Image file extension in this article, is the valid extension for an image file which consists of file name and file extension . The valid image file extension follows some rules which we define in this article. Regular expression or regex is used for pattern matching in strings or string searching algorithms. Its functionalities are defined in the header file. It is used with a regex keyword followed by a variable. In this C++ tutorial, we check whether the input string is a valid image file ...
Read MoreHow to check Aadhaar number is valid or not using Regular Expression?
Introduction In this C++ tutorial, we check whether the input Aadhar number is valid using Regular Expression. Regular expression or regex is used for pattern matching in strings or string searching algorithms. Its functionalities are defined in the header file. It is used with a regex keyword followed by a variable. Indian citizens are issued an Aadhaar number, which is a unique identification number. It is a 12-digit unique number and no two people have a similar AADHAAR number. Syntax regex regular_expression_patternname return regex_match(value, regular_expression_patternname); In this tutorial to check the validity of an Aadhar number we ...
Read MoreDefanged Version of Internet Protocol Address
Introduction This tutorial deals with the problem of finding the defanged version of the Internet Protocol Address. The Internet Protocol Address or IP Address is an individual numerical address of a device connected to or using the Internet. It is unique for every internet-connected device. It consists of numbers separated by the period (dot). An example would be 191.0.1.2. Defanged Version of Internet Protocol means replacing the periods (dot.) with other characters so that it is not treated as a valid IP address. For defanging the Internet Protocol Address we use [.] instead of periods ( dot .) The Internet ...
Read MoreHow to Decode the string encoded with the given algorithm?
Introduction Encoding means converting the text into some form of representation, and decoding is the process of converting the encoded text into its original form. Encoding and decoding are two interrelated techniques for transferring information from one form to another. In this tutorial, we implement an approach to decode the string which is encoded with the given algorithm that finds the decoded string using an encoded string encoded with some algorithm. The string is encoded using the following concept − For example string = India Encoded string = dniIa In the string "India", the middle character is 'd', ...
Read MoreHow to decrypt a string according to given algorithm?
Decryption or decrypt a string is the process used to protect confidential and sensitive data from hackers. It converts encrypted data or text into its original form. Encryption is the process of converting plain text into an unreadable and non-understandable cipher text format so that hackers cannot understand it. These processes are interrelated and involve various algorithms for processing. We decrypt the string according to the following algorithm. If the string length is odd. For odd index values append alphabets from the back of the string and for even index values append alphabets from the front of the input ...
Read MoreCount of all substrings with sum of weights at most K
Introduction In this tutorial, we discuss the problem of counting the substrings from a given string with the sum of weights at most K. To implement the problem statement we consider a string S to generate substrings and some value for k. The character weights are predefined integer values and we consider some value of K like 2, 3 or anything. We count only those substrings whose total weight is equal to the value of K. The weights of the characters are defined in two different ways − When the weights are defined for a string in any order. ...
Read MoreCheck whether the string can be printed using same row of qwerty keypad
Introduction In this tutorial, we will check if an input string can be formed using characters in the same row of the Qwerty keypad. The task is to check whether a given string exists in a single row of the Qwerty keypad. To determine whether a string can be printed with the same row of the Qwerty keypad, all characters should be found in the same row. We implement an approach using set and unordered_set to solve this task. The characters of different rows are stored in different sets or unordered_sets. Compare the string characters to each stored row value. ...
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