摘要：
Description There are N points in total. Every point moves in certain direction and certain speed. We want to know at what time that the largest ... 阅读全文
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Description In this problem we talk about the study of Computer Graphics. Of course, this is very, very hard. We have designed a new mobile phon... 阅读全文
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Description X soldiers from the famous " *FFF* army" is standing in a line, from left to right. You, as the captain of *FFF*, decides to have a ... 阅读全文
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Description If we sum up every digit of a number and the result can be exactly divided by 10, we say this number is a good number. You are requi... 阅读全文
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Description Three wizards are doing a experiment. To avoid from bothering, a special magic is set around them. The magic forms a circle, which co... 阅读全文