摘要：
Little Hasan loves to play number games with his friends. One day they were playing a game whereone of them will speak out a positive number and the o... 阅读全文
摘要：
I have some (say, n) marbles (small glass balls) and I am going to buy some boxes to store them. Theboxes are of two types:T ype 1: each box costs c1 ... 阅读全文