Grading Students - Hacker Rank Solution

At HackerLand University, a passing grade is any grade 40 points or higher on a 100 point scale. Sam is a professor at the university and likes to round each student’s grade according to the following rules:

Sherlock and The Beast - Hacker Rank Solution

Sherlock Holmes suspects his archenemy, Professor Moriarty, is once again plotting something diabolical. Sherlock's companion, Dr. Watson, suggests Moriarty may be responsible for MI6's recent issues with their supercomputer, The Beast.

Angry Professor - Hacker Rank Solution

A Discrete Mathematics professor has a class of N$N$ students. Frustrated with their lack of discipline, he decides to cancel class if fewer than K$K$ students are present when class starts.
Given the arrival time of each student, determine if the class is canceled.