When working with strings, it's common to encounter problems that involve rotation, a process that reorders the characters in a string by moving a certain number of characters to the opposite end of the string. In this article, we will explore an interesting problem: how to minimize the number of characters that must be changed to make the left and right rotation of a string the same. We will provide a well-structured C++ solution and include an example to illustrate the test case. Problem Statement Given a string 's' of length 'n', we need to find the minimum number of ... Read More

In this article, we'll delve into a fascinating problem in the realm of string algorithms: how to find the maximum length palindromic substring for every index such that it starts and ends at that index in a string. This problem is an interesting challenge, especially for those interested in mastering the art of string manipulation in various programming languages. A palindrome is a string that reads the same backward as forward. For example, "madam" is a palindrome. The challenge here is to find the longest palindromic substring for every index in a given string, where the substring starts and ends ... Read More

In this article, we are going to delve into an interesting problem related to string manipulation and dynamic programming in various programming languages. The problem we're discussing today is "Maximize the count of 3-length palindromic subsequences with each index part of a single subsequence". Problem Statement Given a string, the task is to find the maximum count of 3-length palindromic subsequences such that each index in the string is a part of a single subsequence. A 3-length palindromic subsequence is a subsequence of the form "aba", where 'a' and 'b' are any characters. Solution Approach To solve this problem, we'll ... Read More

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