https://paiza.io/projects/XWPSt9TYDA9_j7mr-iVlAw
https://challonge.com/events/MMa6
https://paiza.io/projects/77Zapa3Eel8vWwXuRUYcWg
https://rextester.com/MMBK28719
https://ideone.com/lWbzjM