private void IdentifyRoutes(List<List<Node>> allRoutes, List<Node> currentList, Graph map)
{
foreach (var node in map.Nodes)
{
if (currentList.Count > 0)
if (!map.EdgeExists(currentList.Last(), node.Value))
continue;
if ((currentList.Select(x => x.Key).Contains(node.Key)))
continue;
if (currentList.Count < map.Nodes.Count - 1)
{
if (!(currentList.Select(x => x.Key).Contains(node.Key)))
{
var newList = CloneList(currentList);
newList.Add(node.Value);
IdentifyRoutes(allRoutes, newList, map);
}
}
else
{
var newList = CloneList(currentList);
newList.Add(node.Value);
if (!map.EdgeExists(currentList.Last(), currentList.First()))
continue;
newList.Add(currentList.First());
allRoutes.Add(newList);
}
}
}
public List<List<Node>> GetAllNodeLists(Graph map)
{
var currentList = new List<Node>();
var allRoutes = new List<List<Node>>();
IdentifyRoutes(allRoutes, currentList, map);
return allRoutes;
}
public void InterfaceTest()
{
var map = new Graph();
map.Nodes.Add("A", new Node("A"));
map.Nodes.Add("B", new Node("B"));
map.Nodes.Add("C", new Node("C"));
map.Nodes.Add("D", new Node("D"));
map.Nodes["A"].Edges.Add(map.Nodes["B"], 20);
map.Nodes["A"].Edges.Add(map.Nodes["D"], 35);
map.Nodes["A"].Edges.Add(map.Nodes["C"], 42);
map.Nodes["B"].Edges.Add(map.Nodes["A"], 20);
map.Nodes["B"].Edges.Add(map.Nodes["C"], 30);
map.Nodes["B"].Edges.Add(map.Nodes["D"], 34);
map.Nodes["C"].Edges.Add(map.Nodes["A"], 42);
map.Nodes["C"].Edges.Add(map.Nodes["B"], 30);
map.Nodes["C"].Edges.Add(map.Nodes["D"], 12);
map.Nodes["D"].Edges.Add(map.Nodes["A"], 35);
map.Nodes["D"].Edges.Add(map.Nodes["B"], 34);
map.Nodes["D"].Edges.Add(map.Nodes["C"], 12);
var tspResolver = new TspResolver();
IEnumerable<Node> result = tspResolver.ResolveBruteForce(map);
Debug.Print("Answer: " + result.Select(x => x.Key).Aggregate((x, y) => string.Format("{0} => {1}", x, y)));
}
public IEnumerable<Node> ResolveBruteForce(Graph map)
{
List<Node> result = null;
int resultScore = -1;
foreach (List<Node> nodeList in GetAllNodeLists(map))
{
var score = GetScore(nodeList);
Debug.Print(nodeList.Select(x => x.Key).Aggregate((x, y) => string.Format("{0} => {1}", x, y)));
Debug.Print(score.ToString(CultureInfo.InvariantCulture));
if (resultScore == -1 || score < resultScore)
{
resultScore = score;
result = new List<Node>();
result.AddRange(nodeList);
}
}
return result;
}
