摘要： Description：In the second year of the university somebody started a study on the romantic relations between the students. The relation "romantically i... 阅读全文

摘要： Problem Description：Suppose that we have a square city with straight streets. A map of a city is a square board with n rows and n columns, each repres... 阅读全文

摘要： Description：On a grid map there are n little men and n houses. In each unit time, every little man can move one unit step, either horizontally, or ver... 阅读全文