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Articles by Hafeezul Kareem
Page 20 of 26
Move last element to front of a given Linked List in C++
Given a linked list, we have to move the last element to the front. Let's see an example.Input1 -> 2 -> 3 -> 4 -> 5 -> NULLOutput5 -> 1 -> 2 -> 3 -> 4 -> NULLAlgorithmInitialise the linked list.Return if the linked list is empty or it has single node.Find the last node and second last nodes of the linked list.Make the last node as new head.Update the link of second last node.ImplementationFollowing is the implementation of the above algorithm in C++#include using namespace std; struct Node { int data; struct Node* next; }; void ...
Read MoreMove all zeros to start and ones to end in an Array of random integers in C++
In this tutorial, we are going to write a program that moves all zeroes to front and ones to end of the array.Given an array with zeroes and ones along with random integers. We have to move all the zeroes to start and ones to the end of the array. Let's see an example.Inputarr = [4, 5, 1, 1, 0, 0, 2, 0, 3, 1, 0, 1]Output0 0 0 0 4 5 2 3 1 1 1 1AlgorithmInitialise the array.Initialise an index to 1.Iterate over the given array.If the current element is not zero, then update the value at the ...
Read MoreMove all zeroes to end of array in C++
Given array with multiple zeroes in it. We have to move all the zeroes in the array to the end. Let's see an example.Inputarr = [4, 5, 0, 3, 2, 0, 0, 0, 5, 0, 1]Output4 5 3 2 5 1 0 0 0 0 0AlgorithmInitialise the array.Initialise an index to 0.Iterate over the given array.If the current element is not zero, then update the value at the index with the current element.Increment the index.Write a loop that iterates from the above index to nUpdate all the elements to 0.ImplementationFollowing is the implementation of the above algorithm in C++#include ...
Read MoreMotzkin number in C++
The Motzkin number series starts with 1, 1, 4, 9, etc.., We can get the generalised nth term with the sequence. The Motzkin number sequence is as follows.a0 = 1a1 = 1a2 = 4a3 = 9an = ((2 * n + 1)/ n + 2) * M(n-1) +((3 * n - 3)/ n + 2) * M(n - 2)AlgorithmInitialise the number n.Iterate till n.Update the previous two numbersReturn the last number.ExampleImplementationFollowing is the implementation of the above algorithm in C++#include using namespace std; int getNthTerm(int n) { if(n == 0 || n == 1) { return 1; } int a = 1, b = 1; for(int i = 2; i
Read MoreNext Smaller Element in C++
The next smaller element is the element that is the first smaller element after it. Let's see an example.arr = [1, 2, 3, 5, 4]The next smaller element for 5 is 4 and the next smaller element for elements 1, 2, 3 is -1 as there is no smaller element after them.AlgorithmInitialise the array with random numbersInitialise a stack.Add first element to the stack.Iterate through the element of the array.If the stack is empty, add the current element to the stack.While the current element is smaller than the top element of the stack.Print the top element with the next smaller ...
Read MoreNext Larger element in n-ary tree in C++
The n-ary tree is the tree with n children for each node. We are given a number n and we have to find the next larger element from the n-ary tree.We can find the solution by traversing through the n-ary tree and maintaining the result.AlgorithmCreate n-ary tree.Initialise a result.Write a function to get next larger element.Return if the current node is null.Check the current node data is greater than the expected element or not.If yes, then check whether the result is empty or the result is greater than the current node data.If the above condition satisfies, then update the result.Get ...
Read MoreNext higher number with same number of set bits in C++
We are given a number n, we have to find the number that is greater than n with same number of set bits as n in its binary representation.The digit 1 in the binary representation is called set bit.Let's see an example.Input124Output143AlgorithmInitialise the number n.Write a function get the count of number of set bits.Initialise the iterative variable with n + 1.Write an infinite loop.Check for the number of set bits for numbers equal to the number of set bits of n.Return the number when you find it.Increment the number.ImplementationFollowing is the implementation of the above algorithm in C++#include ...
Read MoreNext higher number using atmost one swap operation in C++
Given a number n, swap any two digits of the number so that the resulting number is greater than the number n. If it's not possible then print -1. Let's see an example.Input12345Output12354We have swapped the digits 4 and 5. And we got the higher number with one swap.AlgorithmIt's not possible to form the number if the digits of the number are in decreasing order.Find the index of the digit from the right of the number which is less than the last digit.Find the index of the digit which is greater than the previous digit and less than all digits.Swap ...
Read MoreNext greater Number than N with the same quantity of digits A and B in C++
Given N, A, and B. Find the number which is greater than N with the same number of A and B digits. Let's see an example.N = 1234 A = 2 B = 3We need to check for every possibility of the given number of digits. There are two digits to form the number. And each digit count in the number should be the same.AlgorithmInitialise A, B, and N.Write a recursive function.Check whether the current number is greater than N and has equal number of A and B digits.Return the number if the above condition satisfies.Add the digit A to the result.Add the digit B ...
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