xinyu04

摘要： Given an $2^n$ by $2^n$ chessboard, with one corner removed, show that you can cover it completely without overlapping or going off the board using on 阅读全文

摘要： A baby is added to a hospital nursery. Before the baby was added there were two boys in the nursery and an uncounted number of girls. After the new ba 阅读全文

摘要： A woman is chosen at random among all women that have two children. She is asked do you have at least one boy, and she answers 'yes.' What is the prob 阅读全文

摘要： Design a logger system that receives a stream of messages along with their timestamps. Each unique message should only be printed at most every 10 sec 阅读全文

摘要： You have a tortilla with radius 1 and wish to form a cone. You may cut out any wedge you like from the tortilla. The point of the wedge must be at the 阅读全文