摘要：
In a billiard table with horizontal side a inches and vertical side b inches, a ball is launched from the middle of the table. After s > 0 seconds the 阅读全文
摘要：
There is a group of n (1 ≤ n ≤ 100) bakers in the town of Utopia. These bakers hold a monthly celebration in which they award a prize to some of the l 阅读全文