adding script file

YellowGraph.cs

+using System;
+using System.Collections.Generic;
+
+class YellowGraph : Graph {
+   
+   // List of nodes in this graph
+   private List<Node> nodes;
+
+   // An adjacency matrix, recording edges between nodes
+   // Edge FROM node i to node j is recorded in adjMatrix[i,j]
+   // Each int entry records the edge cost (> -1)
+   // If entry is 0 there is no edge 
+   private int[,] adjMatrix;
+
+   public YellowGraph() {
+      nodes = new List<Node>();
+      adjMatrix = new int[0,0];
+   }
+
+
+
+   // ADD MISSING METHODS HERE
+
+
+
+   public void Write() {
+      Console.WriteLine("YellowGraph");
+
+      for (int i = 0; i < nodes.Count; i++) {
+         Console.Write(nodes[i] + ": ");
+
+         bool first = true;
+         for (int j = 0; j < nodes.Count; j++) {
+            if (adjMatrix[i,j] > 0) {
+               if (!first) Console.Write(", ");
+               Console.Write(nodes[j] + "(" + adjMatrix[i,j] + ")");
+               first = false;
+            }
+         }
+
+         Console.Write("\n");
+      }
+   }
+}
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