/// <summary>
/// 城市交通 畅通工程
/// </summary>
private static void UnionFindTreeWeightedRoad()
{
// 20 个城市
UnionFindTreeWeighted union = new UnionFindTreeWeighted(20);
// 已经修好的路 7条 0-1 6-9 3-8 5-11 2-12 6-10 4-8
Dictionary <int, int> hadRoad = new Dictionary <int, int>();
hadRoad.Add(0, 1);
hadRoad.Add(6, 9);
hadRoad.Add(3, 8);
hadRoad.Add(5, 11);
hadRoad.Add(2, 12);
//hadRoad.Add(6, 10);
hadRoad.Add(4, 8);
foreach (KeyValuePair <int, int> item in hadRoad)
{
// 调用并查集对象的 union方法让两个城市相交
union.union(item.Key, item.Value);
}
union.union(6, 10);
// 获取当前并查集中分组的数量，就可以得到还需要修建的道路的数目
int roots = union.count() - 1;
Console.WriteLine(string.Format("need {0} roads", roots));
}
/// <summary>
/// 并查集权重 压缩路径
/// </summary>
private static void UnionFindTreeWeightedTest()
{
// 创建并查集
UnionFindTreeWeighted unionTree = new UnionFindTreeWeighted(5);
Console.WriteLine("define: " + unionTree.count());
// 从控制台录入两个要合并的元素，调用union方法合并，观察合并后并查集中的分组是否减少
while (true)
{
string strP = Console.ReadLine();
string strQ = Console.ReadLine();
int p = 0;
int q = 0;
int.TryParse(strP, out p);
int.TryParse(strQ, out q);
// 判断这两个元素是否已经在同一组了
if (unionTree.connected(p, q))
{
Console.WriteLine(string.Format("{0} had {1}", p, q));
continue;
}
unionTree.union(p, q);
Console.WriteLine("union count: " + unionTree.count());
}
}