HBC25030RobotSendsRedPackets[USACO 2007 Dec S]Building Roads题解

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Farmer John had just acquired several new farms!He wants to connect the farms with roads so that he can travel from any farm to any other farm via a sequence of roads; roads already connect some of the farms.Each of the N farms is represented by a position on the plane . Given the preexisting M roads as pairs of connected farms, help Farmer John determine the smallest length of additional roads he must build to connect all his farms.

Farmer John had just acquired several new farms! He wants to connect the farms with roads so that he can travel from any farm to any other farm via a sequence of roads; roads already connect some of the farms. Each of the N (1 ≤ N ≤ 1,000) farms (conveniently numbered 1..N) is represented by a position (Xi, Yi) on the plane (0 ≤ Xi ≤ 1,000,000; 0 ≤ Yi ≤ 1,000,000). Given the preexisting M roads (1 ≤ M ≤ 1,000) as pairs of connected farms, help Farmer John determine the smallest length of additional roads he must build to connect all his farms.

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标签： HBC25030RobotSendsRedPackets[USACO 2007 Dec S]Building Roads题解