Hackerrank

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

You are given a 2D matrix of dimension  and a positive integer . You have to rotate the matrix  times and print the resultant matrix. Rotation should be in anti-clockwise direction. Rotation of a  matrix is represented by the following figure. Note that in one rotation, you have to shift elements

A gene is represented as a string of length  (where  is divisible by ), composed of the letters , , , and . It is considered to be steady if each of the four letters occurs exactly  times. For example,  and  are both steady genes. Bear Limak is a famous biotechnology scientist who specializes in

Given an array of integers, determine whether the array can be sorted in ascending order using only one of the following operations one time. 1. Swap two elements. 2. Reverse one sub-segment. Determine whether one, both or neither of the operations will complete the task. If both work, choose swap.

Given a 2D array of digits or grid, try to find the occurrence of a given 2D pattern of digits. For example, consider the following grid: 1234567890 0987654321 1111111111 1111111111 2222222222 Assume we need to look for the following 2D pattern array: 876543 111111 111111 The 2D pattern begins at

Alice is playing an arcade game and wants to climb to the top of the leaderboard and wants to track her ranking. The game uses Dense Ranking, so its leaderboard works like this: * The player with the highest score is ranked number  on the leaderboard. * Players who have equal scores

Sherlock considers a string to be valid if all characters of the string appear the same number of times. It is also valid if he can remove just  character at  index in the string, and the remaining characters will occur the same number of times. Given a string , determine if

You will be given an array of integers and a target value. Determine the number of pairs of array elements that have a difference equal to a target value. For example, given an array of [1, 2, 3, 4] and a target value of 1, we have three values meeting

Lauren has a chart of distinct projected prices for a house over the next several years. She must buy the house in one year and sell it in another, and she must do so at a loss. She wants to minimize her financial loss. For example, the house is valued