private ListWithDuplicates GetIntersectionsDictFrom(int[] A)
{
ListWithDuplicates dict = new ListWithDuplicates();
for (int i = 0; i < A.Length; i++)
{
int center = i;
int radius = A[i];
Intersection Xn = new Intersection(center, radius);
dict.Add(Xn.leftXn, Xn);
}
return(dict);
}
public int solution(int[] A)
{
int totalNumIntersections = 0;
_PreviousXns = new List <Intersection>();
if (totalNumIntersections > 10000000)
{
return(-1);
}
//(1) Convert into a Dict of name and Intersections
_IntersectionsDict = GetIntersectionsDictFrom(A);
//(2) Sort by LeftXns
_IntersectionsDict = _IntersectionsDict.SortByKey();
if (_IntersectionsDict.Count == 0)
{
return(0);
}
//First (extreme left) value
int leftXn = _IntersectionsDict.ElementAt(0).Key;
Intersection intersection = _IntersectionsDict.ElementAt(0).Value;
_PreviousXns.Add(intersection);
//(2) Now loop left thru right
for (int i = 1; i < _IntersectionsDict.Count; i++)
{
int nextLeftXn = _IntersectionsDict.ElementAt(i).Key;
Intersection nextIntersection = _IntersectionsDict.ElementAt(i).Value;
//Cases for intersections: Need to check against <wort-case> ALL previous Xns!
foreach (Intersection prevIntersection in _PreviousXns)
{
string prn0 = "Comparing " + prevIntersection.name + " with " + nextIntersection.name;
if (prevIntersection.DoesIntersect(nextIntersection))
{
prevIntersection.AddIntersectingXn(nextIntersection); //being added to the Xn on the left, as convention
totalNumIntersections++;
}
}
_PreviousXns.Add(nextIntersection);
}
//(3) Print Results
string prn = "";
List <Intersection> xns = _IntersectionsDict.GetAllValues();
foreach (Intersection xn in xns)
{
prn += xn.name + " Intersects : ";
foreach (Intersection xn2 in xn._IntersectingXns)
{
prn += xn2.name + " , ";
}
}
return(totalNumIntersections);
}