Algorithms

Harold is a kidnapper who wrote a ransom note, but now he is worried it will be traced back to him through his handwriting. He found a magazine and wants to know if he can cut out whole words from it and use them to create an untraceable replica of

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. For example , the list of all anagrammatic pairs is  at

A left rotation operation on an array shifts each of the array's elements  unit to the left. For example, if  left rotations are performed on array , then the array would become . Given an array  of  integers and a number, , perform  left rotations on the array. Return the updated

You are given an unordered array consisting of consecutive integers  [1, 2, 3, ..., n] without any duplicates. You are allowed to swap any two elements. You need to find the minimum number of swaps required to sort the array in ascending order. For example, given the array  we perform the

Comparators are used to compare two objects. In this challenge, you'll create a comparator and use it to sort an array. The Player class is provided in the editor below. It has two fields: 1. : a string. 2. : an integer. Given an array of  Player objects, write a

You are given an array and you need to find number of triplets of indices  such that the elements at those indices are in geometric progression for a given common ratio  and . For example, . If , we have  and  at indices  and . Function Description Complete the countTriplets function in the editor

A group of friends want to buy a bouquet of flowers. The florist wants to maximize his number of new customers and the money he makes. To do this, he decides he'll multiply the price of each flower by the number of that customer's previously purchased

Goodland is a country with a number of evenly spaced cities along a line. The distance between adjacent cities is  unit. There is an energy infrastructure project planning meeting, and the government needs to know the fewest number of power plants needed to provide electricity to the entire list of

You will be given a list of integers, , and a single integer . You must create an array of length  from elements of  such that its unfairness is minimized. Call that array . Unfairness of an array is calculated as Where: - max denotes the largest integer in - min denotes the

The member states of the UN are planning to send  people to the moon. They want them to be from different countries. You will be given a list of pairs of astronaut ID's. Each pair is made of astronauts from the same country. Determine how many pairs of