HBC24325Xor Path,组合数学,数学,数据结构,树[USACO 2012 Mar S]Flowerpot题解

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Farmer John has been having trouble making his plants grow, and needs your help to water them properly. You are given the locations of N raindrops (1

Farmer John has been having trouble making his plants grow, and needs your help to water them properly. You are given the locations of N raindrops (1 <= N <= 100,000) in the 2D plane, where y represents vertical height of the drop, and x represents its location over a 1D number line:   Each drop falls downward (towards the x axis) at a rate of 1 unit per second. You would like to place Farmer John's flowerpot of width W somewhere along the x axis so that the difference in time between the first raindrop to hit the flowerpot and the last raindrop to hit the flowerpot is at least some amount D (so that the flowers in the pot receive plenty of water). A drop of water that lands just on the edge of the flowerpot counts as hitting the flowerpot.  Given the value of D and the locations of the N raindrops, please compute the minimum possible value of W.

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标签： HBC24325Xor Path 组合数学 数学 数据结构 树[USACO 2012 Mar S]Flowerpot题解