摘要：
Problem F. Grab The Tree Problem F. Grab The Tree Little Q and Little T are playing a game on a tree. There are nn vertices on the tree, labeled by 1, 阅读全文
摘要：
逆尼姆博弈 John Little John is playing very funny game with his younger brother. There is one big box filled with M&Ms of different colors. At first John h 阅读全文