摘要：Signals of most probably extra-terrestrial origin have been received and digitalized by The Aeronautic and Space Administration (that must be going th 阅读全文

摘要：King George has recently decided that he would like to have a new design for the royal graveyard. The graveyard must consist of several sections, each 阅读全文

摘要：Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representations does a given positive integ 阅读全文

摘要：A sequence of N positive integers (10 < N < 100 000), each of them less than or equal 10000, and a positive integer S (S < 100 000 000) are given. Wri 阅读全文

摘要：Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she 阅读全文