Hello Codeforces :)
The contest is rated and top 10 contestants from leader board will win HackerRank T-Shirts :D
The contest contains four challenges that are prepared by me (forthright48). I want to thank the HackerRank team and Shafaet, wanbo, svanidz1 and Arterm for testing the tasks. Contestants will have 1 hour to solve these problems, which I hope are enough, but not more than enough.