Keeping track of all the cows can be a tricky task so Farmer John has installed a system to automate it. He has installed on each cow an electronic ID ......
CodeForces - 743A
Vladik is a competitive programmer. This year he is going to win the International Olympiad in Informatics. But it is not as easy as ......
After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities you visited ......