摘要： Problem Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let 阅读全文

摘要： Farmer John's N (1 <= N <= 50,000) cows (numbered 1..N) are planning to run away and join the circus. Their hoofed feet prevent them from tightrope wa 阅读全文

摘要： It is very hard to wash and especially to dry clothes in winter. But Jane is a very smart girl. She is not afraid of this boring process. Jane has dec 阅读全文