摘要：
There is a building of 100 floors. If an egg drops from the Nth floor or above, it will break. If it's dropped from any floor below, it will not break... 阅读全文
摘要：
There is an 8*8 chess board in which two diagnolly opposite corners have been cut off. You are given 31 dominos, and a single domino can cover exactly... 阅读全文