摘要：
Problem DescriptionFat brother and Maze are playing a kind of special (hentai) game on an N*M board (N rows, M columns). At the beginning, each grid o... 阅读全文
摘要：
Problem DescriptionIn mathematics, and more specifically in graph theory, a tree is an undirected graph in which any two nodes are connected by exactl... 阅读全文
摘要：
Problem DescriptionAlice and Bob are playing a game. There are two piles of cards. There are N cards in each pile, and each card has a score. They tak... 阅读全文
摘要：
Problem DescriptionThe doggie found a bone in an ancient maze, which fascinated him a lot. However, when he picked it up, the maze began to shake, and... 阅读全文