HBC24953[网络流24题]最长递增子序列问题[USACO 2008 Jan G]Cell Phone Network题解 （farmerjohn）

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Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N pastures so they can all communicate.Exactly N-1 pairs of pastures are adjacent, and for any two pastures A and B there is a sequence of adjacent pastures such that A is the first pasture in the sequence and B is the last. Farmer John can only place cell phone towers in the pastures, and each tower has enough range to provide service to the pasture it is on and all pastures adjacent to the pasture with the cell tower.Help him determine the minimum number of towers he must install to provide cell phone service to each pasture.

Farmer John has decided to give each of his cows a cell phone in hopes to encourage their social interaction. This, however, requires him to set up cell phone towers on his N (1 ≤ N ≤ 10,000) pastures (conveniently numbered 1..N) so they can all communicate. Exactly N-1 pairs of pastures are adjacent, and for any two pastures A and B (1 ≤ A ≤ N; 1 ≤ B ≤ N; A ≠ B) there is a sequence of adjacent pastures such that A is the first pasture in the sequence and B is the last. Farmer John can only place cell phone towers in the pastures, and each tower has enough range to provide service to the pasture it is on and all pastures adjacent to the pasture with the cell tower. Help him determine the minimum number of towers he must install to provide cell phone service to each pasture.

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标签： HBC24953[网络流24题]最长递增子序列问题[USACO 2008 Jan G]Cell Phone Network题解