标签归档:two point

bzoj-USACO除草计划A

我已经做了30/30


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[bzoj 1071][SCOI2007] 组队

Description

  NBA每年都有球员选秀环节。通常用速度和身高两项数据来衡量一个篮球运动员的基本素质。假如一支球队里速度最慢的球员速度为minV,身高最矮的球员高度为minH,那么这支球队的所有队员都应该满足: A * ( height – minH ) + B * ( speed – minV ) <= C 其中A和B,C为给定的经验值。这个式子很容易理解,如果一个球队的球员速度和身高差距太大,会造成配合的不协调。 请问作为球队管理层的你,在N名选秀球员中,最多能有多少名符合条件的候选球员。

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AIO2011 Solution

Pirates

Yarr! Welcome aboard the Black Pearl! I'm Captain Mia Swamp, and this is my First Matey, Growlybills. We've heard you're handy with these computing contraptions, so I'll make you a deal: help us out with a little problem, and we won't feed you to the sharks.

You're in? Thought so.

\includegraphics[width=10cm]{map_meta}

See that map yonder? That long, thin island there is the Isle of Obstaclewick. Boring place. All you need to know is that it's L nautical miles long from east to west, and so thin we all just say it has zero width.

Our ship, the Black Pearl, is sailing the north coast of the island, X nautical miles from the west point. See the other ship, the one sailing the south coast, Y nautical miles from the west point? That's the HMS Smallerout, our target. It may look like a wibbly-wobbly old thing, but it's carrying some of Britain's greatest treasures.

We can sail either way around the Isle of Obstaclewick, approaching the Smallerout from either side. What we want you to do is tell us which way is shorter. We don't want to overwork the... volunteers... in the galley. So that's your job, landlubber! Write us a program that calculates the shortest distance we have to sail to reach the Smallerout!

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