题目描述 大小为3的棋盘游戏里有3个白色棋子，3个黑色棋子，和一个有7个格子一线排开的木盒子。3个白棋子被放在 […]

题目描述 一个正方形的镇区分为 N2 个小方块（1 <= N <= 7）。农场位于方格的左上角，集 […]

题目描述 A common but insecure method of encrypting text is […]

题目描述 Professors lead very busy lives with full schedule […]

题目描述 Let X be the set of correctly built parenthesis ex […]

题目描述 A company offers personal computers for sale in N […]

题目描述 Tomorrow morning Jill must travel from Hamburg to […]

题目描述 Maja is a bee. She lives in a hive of hexagonal ho […]

题目描述 The children's game Hotter Colder is played a […]

题目描述 A checksum is an algorithm that scans a packet of […]