walfy

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