In this article, we need to reverse the links with the help of a singly linked list. Our task is to create a function that is capable of reversing the given singly linked list. For exampleInput: Following Linked list : 1->2->3->4->NULL Output: After processing of our function: 4->3->2->1->NULLApproach to find The SolutionThere are different approaches to reverse a linked list. Generally, a simple approach comes to our mind to traverse the list and reverse it while going through it.Simple ApproachWe will go through the linked list in this approach and try to reverse it while going through it.Example#include using ... Read More

In this article, we deal with a singly linked list, and the task is to reverse the list in groups of k. For example −Input: 1->2->3->4->5->6->7->8->NULL, K = 3 Output: 3->2->1->6->5->4->8->7->NULL Input: 1->2->3->4->5->6->7->8->NULL, K = 5 Output: 5->4->3->2->1->8For this problem, one approach that comes to mind is trailing the list and reversing the list when our sublist’s size reaches k and continues.Approach to find The SolutionIn this approach, we will generally traverse through the list and keep a counter to count the number of elements in our sub-list. When the counter reaches the count of k, we reverse that ... Read More

In this problem, we are given a pointer to the head of a linked list and an integer k. In groups of size k, we need to reverse the linked list. For example −Input : 1 2 3 4 5 (doubly linked list), k = 3 Output : 3 2 1 5 4Approach to find The SolutionIn this problem, we are going to make a recursive algorithm to solve this problem. In this approach, we are going to use recursion and solve the problem using that.Example#include using namespace std; struct Node ... Read More

In this article we have a doubly linked list, and we will explain different approaches to reverse a doubly linked list in C++. For example −Input : {1, 2, 3, 4} Output : {4, 3, 2, 1}There is generally one approach that comes to mind, but we will use two approaches − The normal and unorthodox approach.Normal ApproachIn this approach, we will go through the list, and as we go through it, we reverse it.Example#include using namespace std; class Node {    public:    int data;    Node *next;    Node *prev; }; void reverse(Node **head_ref) ... Read More

In this article, we will understand the Reversal algorithm to rotate a given array by k-elements to the right, for example −Input : arr[ ] = { 4, 6, 2, 6, 43, 7, 3, 7 }, k = 4 Output : { 43, 7, 3, 7, 4, 6, 2, 6 } Explanation : Rotating each element of array by 4-element to the right gives { 43, 7, 3, 7, 4, 6, 2, 6 }. Input : arr[ ] = { 8, 5, 8, 2, 1, 4, 9, 3 }, k = 3 Output : { 4, 9, 3, 8, ... Read More

In the given problem, we are given an array, and we are required to rotate the array by d elements using a reversal algorithm, for example −Input : arr[] = [1, 2, 3, 4, 5, 6, 7], d = 2 Output : arr[] = [3, 4, 5, 6, 7, 1, 2] Explanation : As you can see we have to rotate this array by d = 2 but our main task is to achieve this by using a reversal technique.We make some calculations for the rotation of the array by reversal technique, and we conclude that −First, we reverse the ... Read More

If you are a programmer, you write the code; If you write the code, you use the function; if you use the function, you use return and exit statements in every function. So In this article, we will discuss what a return statement and exit statement are and their differences.In C++, return is a statement that returns the control of the flow of execution to the function which is calling.Exit statement terminates the program at the point it is used.int main()This is where the execution of the program begins. The program is executed from the main() function, and since ... Read More

Sizeof operator is one of the most used operators in C language used to compute the size of any data structure or data type that we pass through it. The sizeof operator returns unsigned integer type, and this operator can be applied to primitive and compound data types. We can use sizeof operator directly to data types and know the memory it is taking up −Example#include using namespace std; int main() {    cout

In this article, we will discuss finding the number of repeated units divisible by N. Repeated units are the repetitive numbers of 1 only, Let R(k) be the repetitive unit where k is the length of 1’s. E.g R(4) = 1111. So we need to find the minimum number of k for which R(k) is divisible by N, for example −Input : N = 13 Output : k = 6 Explanation : R(6) i.e 111111 is divisible by 13. Input : N = 31 Output : k = 15Approach to find The SolutionYou can approach this problem by checking ... Read More

In this article, we will discuss how to remove elements between two zeros from a given string that contains only zero’s and one’s character. The final string should not contain any character ‘1’ surrounded by 0’s. For example −Input : string = “110010” Output : “11000” Explanation: 1 is found between two zeros at the 4th index. Input : string = “0010” Output : “000” Explanation : 1 is found between two zeros at the 2nd index.Approach to find The SolutionWe can apply a simple approach, i.e., traverse the string using a loop and check the previous and next ... Read More