Short Problem Definition: The professor is conducting a course on Discrete Mathematics to a class of N students. He is angry at the lack of their discipline, and he decides to cancel the class if there are less than K students present after the class starts. Given the arrival time of each student, your task is to find out if the class gets cancelled or not. Link Angry Professor Complexity: time...

## HackerRank âApple and Orangeâ Solution

Short Problem Definition: Samâs house has an apple tree and an orange tree that yield an abundance of fruit. In the diagram below, the red region denotes his house, where s is the start point, and i is the endpoint. The apple tree is to the left of his house, and the orange tree is to its right. You can assume the trees are located on a single point, where the apple tree is at point a, and the...

## HackerRank âBalanced Parenthesesâ Solution

Short Problem Definition: Given a sequence consisting of parentheses, determine whether the expression is balanced. Link Balanced Parentheses Complexity: time complexity is O(N) space complexity is O(N) Execution: Equivalent to Codility Brackets. Solution: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 def isValidPair(left...

## HackerRank âBetween Two Setsâ Solution

Short Problem Definition: You will be given two arrays of integers and asked to determine all integers that satisfy the following two conditions: The elements of the first array are all factors of the integer being considered The integer being considered is a factor of all elements of the second array Link Between Two Sets Complexity: time complexity is O(A* (N+M)) space complexity is O(1)...

## HackerRank âBigger is Greaterâ Solution

Short Problem Definition: Given a word w, rearrange the letters of w to construct another word in such a way that is lexicographically greater than w. In case of multiple possible answers, find the lexicographically smallest one among them. Link Bigger is Greater Complexity: time complexity is O(N) space complexity is O(N) Execution: This task challenges us to find the next...

## HackerRank âBirthday Cake Candlesâ Solution

Short Problem Definition: Calculate and print the sum of the elements in an array, keeping in mind that some of those integers may be quite large. Link A Very Big Sum Complexity: time complexity is O(N) space complexity is O(1) Execution: Just add all of this together. No magic. Solution: 1 2 3 4 5 #!/usr/bin/py if __name__ == '__main__': t = input()...

## HackerRank âBirthday Chocolateâ Solution

Short Problem Definition: The member states of the UN are planning to send 2 people to the moon. They want them to be from different countries. You will be given a list of pairs of astronaut IDâs. Each pair is made of astronauts from the same country. Determine how many pairs of astronauts from different countries they can choose from. Link Birthday Chocolate Complexity: time complexity is O(N)...

## HackerRank âBon AppĂ©titâ Solution

Short Problem Definition: Anna and Brian are sharing a meal at a restaurant and they agree to split the bill equally. Brian wants to order something that Anna is allergic to though, and they agree that Anna wonât pay for that item. Brian gets the check and calculates Annaâs portion. You must determine if his calculation is correct. Link Bon AppĂ©tit Complexity: time complexity is O(N) space...