In this article, we are going to explore an interesting problem related to string manipulation in C++. The problem statement is "Sum of frequencies of characters of a string present in another string". This problem provides a great opportunity to enhance your understanding of string operations, character frequency calculation, and the concept of mapping in C++. Problem Statement Given two strings, the task is to find the sum of frequencies of characters of the first string that are present in the second string. C++ Solution Approach To solve this problem, we will first create frequency maps for both strings using ... Read More

In this article, we will delve into a specific aspect of string handling in C++: the string::npos constant. string::npos is a static member constant value with the greatest possible value for an element of type size_t. This constant is defined with a value of -1, which, when cast to size_t, gives us the largest possible representation for size_t. In the context of strings in C++, it is generally used to indicate an invalid position. What is String::npos? In C++, string::npos is a constant static member of the std::string class that represents the maximum possible value for the size_t type. It ... Read More

In this article, we dive into a unique and interesting problem related to arrays and string manipulation in C++. The problem at hand is "Sort an array of strings in ascending order with each string sorted in descending order". This problem is an excellent way to enhance your knowledge of string manipulation, arrays, and sorting algorithms. Problem Statement Given an array of strings, the task is to sort the array in ascending order, but with each string sorted in descending order. C++ Solution Approach We can solve this problem by using the sort function provided by the C++ Standard Library. ... Read More

This article delves into an interesting string manipulation problem: "Remove all occurrences of a word from a given string using Z-algorithm". This problem serves as an excellent use case for the Z-algorithm, highlighting its efficacy in pattern searching problems. Let's explore in detail. Problem Statement Given a string S and a word W, the task is to remove all occurrences of W from S using the Z-algorithm. Understanding the Problem Consider a string S = "HelloWorldHelloWorld" and a word W = "World". The goal is to remove all occurrences of W from S. Hence, the output would be "HelloHello". Z-algorithm ... Read More

In this article, we're going to unravel an interesting problem from the domain of string manipulation: "Rearrange a string to maximize the minimum distance between any pair of vowels". This problem challenges us to manipulate the arrangement of characters in a string to ensure the maximum possible minimum distance between any two vowel characters. We'll discuss the problem in detail, provide a C++ code implementation, and illustrate with an example. Understanding the Problem Statement Given a string, the task is to rearrange the characters in the string in such a way that the minimum distance between any pair of vowels ... Read More

In this article, we will delve into an interesting and practical problem related to string manipulation in C programming. We are going to build a "Random Password Generator" in C. This problem not only enhances your understanding of string manipulation but also your knowledge of the C Standard Library. Problem Statement The task is to build a program that generates a random password of a specified length. The password should include uppercase and lowercase alphabets, digits, and special characters. C Solution Approach To solve this problem, we'll leverage the power of the C Standard Library. We'll use the rand() function ... Read More

In this article, we will be discussing how to construct a Deterministic Finite Automaton (DFA) for the Regular Expression C(A + B)+ using C++. We'll start by understanding the problem and the theory behind it, then we'll dive into the implementation and conclude with a relevant example to demonstrate its use. Understanding the Problem Statement A Deterministic Finite Automaton (DFA) is a theoretical model of computation used in automata theory, a branch of theoretical computer science. It's one of the simplest types of automata and an essential concept in the study of compilers and parsers. The task here is to ... Read More

In this article, we will be exploring an interesting problem related to expressions and grammar in C++. The problem statement is "Print a sorted list of words represented by the expression under the given grammar". This problem offers a great opportunity to brush up your knowledge on parsing expressions, handling strings, and sorting algorithms in C++. Problem Statement Given a string expression where each character represents a lowercase English letter and the '|' character represents an OR operation, the task is to print a sorted list of all possible words represented by the expression. C++ Solution Approach Our approach to ... Read More

In this article, we'll delve into a fascinating problem that involves numbers and permutations: "Permutation of a number whose sum with the original number is equal to another given number". This problem offers a unique intersection of number theory and combinatorics, making it a compelling challenge to tackle. To clarify, given an original number and a target number, we need to find a permutation of the original number such that, when we add the original number and its permutation, we get the target number. Understanding the Problem In essence, this problem combines the concepts of number permutation, summation, and equality ... Read More

In this article, we will explore a common string manipulation problem: moving all digits to the beginning of a given string. This task is often seen in data cleaning or preprocessing, where we need to standardize or reformat strings in a certain way. To tackle this problem, we'll use C++, a widely-used programming language celebrated for its efficiency and control. Problem Statement Given a string that contains alphanumeric characters, our task is to move all the digits present in the string to the beginning, while keeping the order of the rest of the characters the same. Solution Approach Our approach ... Read More