In this problem, we need to find the total number of rotations to get the same string. The naïve approach to solving the problem is that we can keep rotating the string. We can print the total number of required rotations if we find the same string. Also, other approaches ... Read More

In this problem, we will find all Lyndon words using the array's alphanumeric characters. Before we start, let’s understand the definition of the Lyndon word. All words are Lyndon words which are strictly lexicographically smaller than all of their rotations. Here are examples of Lyndon words. ... Read More

In this problem, we need to achieve the same string by performing the rotations of the string and need to count rotations. There can be different ways to solve the problem, but here we will learn some best approaches in PHP. The first approach uses the rotational substring, and another ... Read More

Problem statement − We have given the binary string of length N. We need to find the minimum number of flipping characters required to get the balanced binary string. Flipping characters means converting 0 to 1 and 1 to 0. If any string contains an equal number of ‘01’ and ... Read More

In this problem, we need to ensure whether the string String2 contains string String1 as a substring. We will first see the naïve approach to solving the problem, finding all substrings of String1’s length in String2 with String1. Furthermore, we will use built−in methods like match(), includes(), and indexOf() methods ... Read More

In this problem, we need to add spaces before the given indexes in the string. We can use two different approaches to solve the problem. The first approach moves the characters of the given string to add space at a particular index, and the second approach replaces the characters of ... Read More

We need to find all palindrome strings from the given array in this problem. The string is a palindrome if we can read it the same from the start and end. We can use two approaches to check whether the string is a palindrome. In the first approach, we reverse ... Read More

In this problem, we need to decode the given string by repeatedly adding the total count number of times. We can have three different approaches to solving the problem, and we can use two stacks or one stack to solve the problem. Also, we can solve the problem without ... Read More

In this problem, we need to count the total vowels and constants in the given linked list. We can traverse the linked list and check for each character, whether it is a constant or vowel. Problem statement − We have given a linked list containing the lowercase alphabetical characters. We ... Read More

In this problem, we need to perform the given operations with each string prefix. In the end, we need to count the frequency of each character. We can follow the greedy approach to solve the problem. We need to take each prefix of length K and update its characters according ... Read More