update:

TMI-practicum/Circle.cs

@@ -32,8 +32,8 @@ namespace TMI_practicum
             double px =  X + a * (c1.X - X) / d;
             double py = Y + a * (c1.Y - Y) / d;
             
-            double htemp =  Math.Round(R * R - a * a, 15);
+            double htemp =  R * R - a * a;
-            if (htemp == 0)
+            if (Math.Round(htemp, 15) == 0)
             {
                 intersections = new Intersection[1];
                 intersections[0] = new Intersection(Math.Round(px, 15), Math.Round(py, 15));
@@ -41,7 +41,7 @@ namespace TMI_practicum
             else
             {
                 intersections = new Intersection[2];
-                double h = Math.Round(Math.Sqrt(htemp), 15);
+                double h = Math.Sqrt(htemp);
                 intersections[0] = new Intersection(Math.Round(px + h * (c1.Y - Y) / d, 15), Math.Round(py - h * (c1.X - X) / d, 15));
                 intersections[1] = new Intersection(Math.Round(px - h * (c1.Y - Y) / d, 15), Math.Round(py + h * (c1.X - X) / d, 15));
             }

TMI-practicum/Program.cs

@@ -78,10 +78,12 @@ namespace TMI_practicum
                         solved.Contains(new Intersection(intersection.X, intersection.Y + 10e-15)) ||
                         solved.Contains(new Intersection(intersection.X, intersection.Y - 10e-15))
                     ) continue;
+
+                    Console.WriteLine(InCircles(circles));
                     
                     failed = true;
                     Console.WriteLine("Not found: {0}\t{1}", intersection.X, intersection.Y);
-                    Console.WriteLine("corrrect");
+                    Console.WriteLine("correct");
                     foreach (var intersection1 in correctSol)
                     {
                         Console.WriteLine("{0}\t{1}", intersection1.X, intersection1.Y);
@@ -203,5 +205,27 @@ namespace TMI_practicum
                 sw.WriteLine("\r\n{0}", time);
             }
         }
+
+
+        private static int InCircles(IList<Circle> circles)
+        {
+            int count = 0;
+
+            foreach (var toCheck in circles)
+            {
+                foreach (var circle in circles)
+                {
+                    if (circle == toCheck) continue;
+
+                    if (circle.R > toCheck.R && circle.Distance(toCheck) < circle.R &&
+                        circle.FindIntersections(toCheck) == null)
+                    {
+                        count++;
+                    }
+                }
+            }
+
+            return count;
+        }
     }
 }

TMI-practicum/SweepLineEffAlgorithm.cs

@@ -117,12 +117,6 @@ namespace TMI_practicum
             if (intersects == null) return;
             foreach (var intersection in intersects)
             {
-//                if (upper)
-//                {
-//                    if (intersection.Y < circle.Y) continue;
-//                }
-//                else if (intersection.Y > circle.Y) continue;
-
                 if (intersections.Contains(intersection)) continue;
                 events.Add(new Event(Event.EventType.Intersection, intersection.X, circle, intersection.Y,
                     new[] {new C5.KeyValuePair<SegmentKey, Circle>(segment, circle), neighbour}));
@@ -197,7 +191,7 @@ namespace TMI_practicum
             {
                 get
                 {
-                    if (_lastX.Equals(_sweepline)) return _lastY;
+                    if (_lastX == _sweepline) return _lastY;
                     _lastX = _sweepline;
                     _lastY = CalculateY(_circle, Type);
                     return _lastY;
@@ -218,10 +212,10 @@ namespace TMI_practicum
 
             public int CompareTo(SegmentKey other)
             {
-                if (_identifier.Equals(other._identifier)) return Type.CompareTo(other.Type);
+                if (_identifier == other._identifier) return Type.CompareTo(other.Type);
-                if (!Y.Equals(other.Y)) return Y.CompareTo(other.Y);
+                if (Y != other.Y) return Y.CompareTo(other.Y);
 
-                return Type.Equals(other.Type) ? _identifier.CompareTo(other._identifier) : Type.CompareTo(other.Type);
+                return Type == other.Type ? _identifier.CompareTo(other._identifier) : Type.CompareTo(other.Type);
             }
 
             public override bool Equals(object obj)
@@ -229,7 +223,7 @@ namespace TMI_practicum
                 if (obj == null || GetType() != obj.GetType()) return false;
                 SegmentKey r = (SegmentKey) obj;
 
-                return _identifier.Equals(r._identifier) && Type.Equals(r.Type);
+                return _identifier  == r._identifier && Type == r.Type;
             }
 
             public override int GetHashCode()
@@ -246,6 +240,7 @@ namespace TMI_practicum
 
         private static double CalculateY(Circle circle, SegmentKey.SegmentType type)
         {
+            if (_sweepline > circle.X + circle.R || _sweepline < circle.X - circle.R) return circle.Y;
             return type == SegmentKey.SegmentType.Upper
                 ? Math.Round(Math.Sqrt(circle.R * circle.R - Math.Pow(_sweepline - circle.X, 2)) + circle.Y, 14)
                 : Math.Round(-Math.Sqrt(circle.R * circle.R - Math.Pow(_sweepline - circle.X, 2)) + circle.Y, 14);