void InitPriorityQueue()
{
for (int i = 0; i < edges.Count; i++)
{
if (edges[i].from < edges[i].to)
{
pq.AddEx(new LeftEndfPoint(edges[i].from));
pq.AddEx(new RightEndfPoint(edges[i].to));
}
else
{
pq.AddEx(new LeftEndfPoint(edges[i].to));
pq.AddEx(new RightEndfPoint(edges[i].from));
}
}
}
