/// <summary>
/// Creates a dictionary that stores IDs of ConnectedNodeGroups contained within each ConnectedNodeGroup.
/// </summary>
/// <param name="connectedGroups">List of ConnectedNodeGroups, sorted in order of area size, descending.</param>
/// <returns></returns>
public static SortedDictionary <int, HashSet <int> > StoreNestedGroups(SortedList <int, ConnectedNodeGroup> connectedGroups)
{
if (connectedGroups is null)
{
throw new ArgumentNullException(nameof(connectedGroups));
}
var idsContainedInGroup = new SortedDictionary <int, HashSet <int> >();
for (int i = 0; i < connectedGroups.Count; i++)
{
ConnectedNodeGroup thisGroup = connectedGroups[i];
idsContainedInGroup.Add(thisGroup.id, new HashSet <int>());
for (int j = 0; j < connectedGroups.Count; j++)
{
ConnectedNodeGroup otherGroup = connectedGroups[j];
if (i != j && thisGroup.IsOtherGroupInThisGroup(otherGroup))
{
idsContainedInGroup[thisGroup.id].Add(otherGroup.id);
}
}
}
return(_SimplifyNestedGroups(idsContainedInGroup));
}
