The ASCII (American Standard Code for Information Interchange) system is often used in programming to manipulate characters. In this article, we will be examining an interesting problem where we need to make all characters of a string same by the minimum number of increments or decrements of ASCII values of characters. We will provide a detailed explanation of the problem, propose an efficient solution in C++, and analyze its complexity. Understanding the Problem Given a string consisting of lowercase English letters, our task is to make all characters in the string the same by changing their ASCII values. The catch ... Read More

In the realm of string manipulation, identifying patterns and extracting meaningful substrings are common tasks. One intriguing problem involves finding the longest substring where no adjacent characters are adjacent English alphabets. In this article, we'll delve into an efficient solution to this problem, along with a clear explanation and an example test case. Problem Statement Given a string of lowercase English alphabets, we need to find the length of the longest substring where no adjacent characters are adjacent English alphabets. For example, in the string "abacabx", the longest substring satisfying this condition is "abx", with a length of 3. Approach ... Read More

Binary trees are fundamental data structures in computer science, providing an efficient way to organize data hierarchically. When traversing these trees, we often uncover intriguing computational problems. Among these, identifying the lexicographically smallest palindromic path is a fascinating challenge. This article elucidates an effective C++ algorithm to solve this problem and provides a detailed example for better understanding. Problem Statement In a binary tree where each node represents a lowercase English letter, our objective is to discover the lexicographically smallest palindromic path. If several paths qualify, we can return any of them. If no palindromic path exists, we should return ... Read More

String manipulation is an essential topic in computer science that involves operations such as concatenation, substring, reversing, and more. One interesting problem related to string manipulation is to find the lexicographic rank of a string among all its substrings. In this article, we will discuss an algorithm to solve this problem using recursion and backtracking. Problem Statement Given a string S of length N, we have to find the lexicographic rank of S among all its substrings. The lexicographic rank is defined as the position of a string in the lexicographically sorted list of all its substrings. Approach We can ... Read More

In this article, we will explore an intriguing problem that involves binary strings and lexicographic ordering. Our task is to find the lexicographic rank of a given binary string. We'll demonstrate our solution, a popular programming language known for its efficiency and flexibility. Understanding Lexicographic Ordering Lexicographic or lexicographical ordering (also known as alphabetical or dictionary ordering) refers to the arrangement of words based on the alphabetical order of their component letters. Problem Statement Given a binary string, we need to determine its lexicographic rank among all its permutations. The lexicographic rank of a string is its position in the ... Read More

In this article, we will explore the problem of finding the lengths of maximized partitions of a string with unique characters. We will first understand the problem statement and then investigate both the naive and efficient approaches to solve this problem, along with their respective algorithms and time complexities. Lastly, we will implement the solution. Problem Statement Given a string, partition the string into as many substrings as possible such that each character of the string appears in only one substring. Return the lengths of these maximized partitions. Naive Approach The naive approach is to iterate through the string, ... Read More

In this article, we will discuss the problem of finding the length of the longest substring that needs to be deleted to make one string equal to another. We will first understand the problem statement and then explore both the naive and efficient approaches to solve this problem, along with their respective algorithms and time complexities. Lastly, we will implement the solution. Problem Statement Given two strings, A and B, determine the length of the longest substring that needs to be deleted from string A to make it equal to string B. Naive Approach The naive approach is to generate ... Read More

In this article, we delve into a fascinating problem in the realm of string manipulation and anagram analysis. Specifically, we'll be finding the length of the longest prefix anagram that is common to two given strings. Our solution leverages C, C++, Java and Python, a powerful and versatile programming languages beloved by software developers. Understanding Anagrams An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. For instance, the words 'listen' and 'silent' are anagrams of each other. Problem Statement Given two strings, we ... Read More

In this article, we'll discuss an engaging problem related to strings and sequences. The problem statement is "Generate a sequence determined by the characters of a given string". This problem is an excellent way to enhance your skills in string manipulation and sequence generation. Problem Statement Given a string, the task is to generate a sequence where each character of the string is replaced by its position in the English alphabet. Solution Approach Our approach to this problem is straightforward. We will iterate over the string and for each character, we will calculate its position in the English alphabet. The ... Read More

When working with natural language processing or text analysis, it is often necessary to search for specific words or phrases within a larger body of text. One common task is finding all the words in a sentence that start with a given prefix. In this article, we will explore how to accomplish this task. Algorithm Read in the input sentence and prefix. Tokenize the input sentence into individual words. For each word in the sentence, check if it starts with the given prefix. If the word starts with the prefix, add it to the list of words that match. ... Read More