Hackerrank
We say that a string contains the word hackerrank if a subsequence of its characters spell the word hackerrank. For example, if string it does contain hackerrank, but does not. In the second case, the second r is missing. If we reorder the first string as , it no longer contains
Hackerrank
Sami's spaceship crashed on Mars! She sends a series of SOS messages to Earth for help. Letters in some of the SOS messages are altered by cosmic radiation during transmission. Given the signal received by Earth as a string, , determine how many letters of Sami's SOS
Hackerrank
Alice wrote a sequence of words in CamelCase as a string of letters, , having the following properties: * It is a concatenation of one or more words consisting of English letters. * All letters in the first word are lowercase. * For each of the subsequent words, the first letter is uppercase and
Hackerrank
You are given a square map as a matrix of integer strings. Each cell of the map has a value denoting its depth. We will call a cell of the map a cavity if and only if this cell is not on the border of the map and each cell
Hackerrank
You are the benevolent ruler of Rankhacker Castle, and today you're distributing bread. Your subjects are in a line, and some of them already have some loaves. Times are hard and your castle's food stocks are dwindling, so you must distribute as few loaves as possible
Hackerrank
Lisa just got a new math workbook. A workbook contains exercise problems, grouped into chapters. Lisa believes a problem to be special if its index (within a chapter) is the same as the page number where it's located. The format of Lisa's book is as follows:
Hackerrank
Calvin is driving his favorite vehicle on the 101 freeway. He notices that the check engine light of his vehicle is on, and he wants to service it immediately to avoid any risks. Luckily, a service lane runs parallel to the highway. The service lane varies in width along its
Hackerrank
Little Bobby loves chocolate. He frequently goes to his favorite store, Penny Auntie, to buy them. They are having a promotion at Penny Auntie. If Bobby saves enough wrappers, he can turn them in for a free chocolate. For example, Bobby has to spend on bars of chocolate that cost
Hackerrank
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
Hackerrank
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
Hackerrank
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
Hackerrank
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