Statement

Giorgio is busy setting up the servers that will host the first OIS round. However, he notices that they are very slow, so he starts investigating to find out what is wrong. It turns out some of the disks are broken and need to be replaced! Giorgio knows that the servers are used everyday from hour A to hour B. He also knows that he will need T contiguous hours to replace the broken disks. If Giorgio chooses when to begin the maintenance in an optimal way, what is the minimum number of hours of downtime?