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摘要：棋盘问题 Descriptions: 在一个给定形状的棋盘（形状可能是不规则的）上面摆放棋子，棋子没有区别。要求摆放时任意的两个棋子不能放在棋盘中的同一行或者同一列，请编程求解对于给定形状和大小的棋盘，摆放k个棋子的所有可行的摆放方案C。 Input 输入含有多组测试数据。 每组数据的第一行是两个正 阅读全文

摘要：Zipper Descriptions: Given three strings, you are to determine whether the third string can be formed by combining the characters in the first two str 阅读全文

摘要：Catch That Cow Descriptions: Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a point 阅读全文