摘要： You are trapped in a 3D dungeon and need to find the quickest way out! The dungeon is composed of unit cubes which may or may not be filled with rock. 阅读全文

摘要： ZZX has a sequence of boxes numbered 1,2,...,n1,2,...,n. Each box can contain at most one ball. You are given the initial configuration of the balls. 阅读全文