might solved feladat 4

fordulo_3/Program/Virus.cs

@@ -47,5 +47,22 @@ namespace Program
                 infected.PrintInfectionTreeWithDepth(maxDepth, currentDepth + 1, indent + "  ");
             }
         }
+
+        public int CountInfectedInDepthRange(int minDepth, int maxDepth, int currentDepth = 0)
+        {
+            int count = 0;
+
+            if (currentDepth >= minDepth && currentDepth <= maxDepth)
+            {
+                count++;
+            }
+
+            foreach (var infected in Infected)
+            {
+                count += infected.CountInfectedInDepthRange(minDepth, maxDepth, currentDepth + 1);
+            }
+
+            return count;
+        }
     }
 }