HBC24945条件,图论,思维[USACO 2008 Jan B]Costume Party题解

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Farmer John is taking the cows to a costume party, but unfortunately he only has one costume. The costume fits precisely two cows with a length of S (1

It's Halloween! Farmer John is taking the cows to a costume party, but unfortunately he only has one costume. The costume fits precisely two cows with a length of S (1 <= S <= 1,000,000). FJ has N cows (2 <= N <= 20,000) conveniently numbered 1..N; cow i has length Li (1 <= Li <= 1,000,000). Two cows can fit into the costume if the sum of their lengths is no greater than the length of the costume. FJ wants to know how many pairs of two distinct cows will fit into the costume.

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标签： HBC24945条件 图论 思维[USACO 2008 Jan B]Costume Party题解