In this Stock Maximize HackerRank solution, Your algorithms have become so good at predicting the market that you now know what the share price of Wooden Orange Toothpicks Inc. (WOT) will be for the next number of days. Each day, you can either buy one share of WOT, sell any number of shares of WOT … Read more

In this Waiter HackerRank solution, You are a waiter at a party. There is a pile of numbered plates. Create an empty  array. At each iteration, , remove each plate from the top of the stack in order. Determine if the number on the plate is evenly divisible by the  prime number. If it is, stack it in … Read more

In this Delete duplicate-value nodes from a sorted linked list HackerRank solution, You are given the pointer to the head node of a sorted linked list, where the data in the nodes is in ascending order. Delete nodes and return a sorted list with each distinct value in the original list. The given head pointer … Read more

In this Balanced Brackets HackerRank solution, A bracket is considered to be any one of the following characters: (, ), {, }, [, or ]. Two brackets are considered to be a matched pair if the an opening bracket (i.e., (, [, or {) occurs to the left of a closing bracket (i.e., ), ], or }) of the exact same type. There are three types of matched pairs of … Read more

In this Super Reduced String HackerRank solution, Reduce a string of lowercase characters in range ascii[‘a’..’z’]by doing a series of operations. In each operation, select a pair of adjacent letters that match, and delete them. Delete as many characters as possible using this method and return the resulting string. If the final string is empty, return Empty … Read more

In this Sherlock and Anagrams HackerRank solution, Two strings are anagrams of each other if the letters of one string can be rearranged to form the other string. Given a string, find the number of pairs of substrings of the string that are anagrams of each other. Example The list of all anagrammatic pairs is  at positions  respectively. Function … Read more

In this Queue using Two Stacks HackerRank solution, A queue is an abstract data type that maintains the order in which elements were added to it, allowing the oldest elements to be removed from the front and new elements to be added to the rear. This is called a First-In-First-Out (FIFO) data structure because the first element added to … Read more

In this Inserting a Node Into a Sorted Doubly Linked List HackerRank solution, Given a reference to the head of a doubly-linked list and an integer, , create a new DoublyLinkedListNode object having data value  and insert it at the proper location to maintain the sort. Example  refers to the list  Return a reference to the new list: . Function … Read more

In this Ice Cream Parlor HackerRank solution, Two friends like to pool their money and go to the ice cream parlor. They always choose two distinct flavors and they spend all of their money. Given a list of prices for the flavors of ice cream, select the two that will cost all of the money … Read more

In this Cycle Detection HackerRank solution, A linked list is said to contain a cycle if any node is visited more than once while traversing the list. Given a pointer to the head of a linked list, determine if it contains a cycle. If it does, return . Otherwise, return . Example  refers to the list of nodes  The … Read more