dmystery

题面 Freddy Frog is sitting on a stone in the middle of a lake. Suddenly he notices Fiona Frog who is sitting on another stone. He plans to visit her, but since the water is dirty and full of tourists’

题面： — Thanks a lot for today. — I experienced so many great things. — You gave me memories like dreams… But I have to leave now… — One last request, can you… — Help me solve a Codeforces problem?

题意 Today is Ignatius’ birthday. He invites a lot of friends. Now it’s dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each othe