Algorithms

Given a sequence of integers , a triplet  is beautiful if: Given an increasing sequence of integers and the value of , count the number of beautiful triplets in the sequence. For example, the sequence  and . There are three beautiful triplets, by index: . To test the first triplet,  and . Function Description Complete

A modified Kaprekar number is a positive whole number with a special property. If you square it, then split the number into two integers and sum those integers, you have the same value you started with. Consider a positive whole number  with  digits. We square  to arrive at a number

Taum is planning to celebrate the birthday of his friend, Diksha. There are two types of gifts that Diksha wants from Taum: one is black and the other is white. To make her happy, Taum has to buy  black gifts and  white gifts. * The cost of each black gift is

Karl has an array of integers. He wants to reduce the array until all remaining elements are equal. Determine the minimum number of elements to delete to reach his goal. For example, if his array is , we see that he can delete the  elements  and  leaving . He could also delete

Watson likes to challenge Sherlock's math ability. He will provide a starting and ending value describing a range of integers. Sherlock must determine the number of square integers within that range, inclusive of the endpoints. Note: A square integer is an integer which is the square of an

Aerith is playing a cloud hopping game. In this game, there are sequentially numbered clouds that can be thunderheads or cumulus clouds. Her character must jump from cloud to cloud until it reaches the start again. To play, Aerith is given an array of clouds,  and an energy level . She

HackerLand Enterprise is adopting a new viral advertising strategy. When they launch a new product, they advertise it to exactly  people on social media. On the first day, half of those  people (i.e., ) like the advertisement and each shares it with  of their friends. At the beginning of the

When you select a contiguous block of text in a PDF viewer, the selection is highlighted with a blue rectangle. In this PDF viewer, each word is highlighted independently. For example: In this challenge, you will be given a list of letter heights in the alphabet and a string. Using

Dan is playing a video game in which his character competes in a hurdle race. Hurdles are of varying heights, and Dan has a maximum height he can jump. There is a magic potion he can take that will increase his maximum height by  unit for each dose. How many

Gary is an avid hiker. He tracks his hikes meticulously, paying close attention to small details like topography. During his last hike he took exactly  steps. For every step he took, he noted if it was an uphill, , or a downhill,  step. Gary's hikes start and end at