public void AddRoute(Itenary <T> origin, Itenary <T> dest)
{
if (!_adj.ContainsKey(origin))
{
_adj[origin] = new List <Itenary <T> >();
}
if (!_adj.ContainsKey(dest))
{
_adj[dest] = new List <Itenary <T> >();
}
_adj[origin].Add(dest);
}
public Stack <Itenary <T> > ShortestPath(Itenary <T> source, Itenary <T> dest)
{
var path = new Dictionary <Itenary <T>, Itenary <T> >();
var distance = new Dictionary <Itenary <T>, int>();
foreach (var route in _adj.Keys)
{
distance[route] = -1;
}
distance[source] = 0;
var q = new Queue <Itenary <T> >();
q.Enqueue(source);
while (q.Count > 0)
{
var route = q.Dequeue();
if (_adj.ContainsKey(route))
{
foreach (var adj in _adj[route].Where(n => distance[n] == -1))
{
distance[adj] = distance[route] + 1;
path[adj] = route;
q.Enqueue(adj);
}
}
}
var res = new Stack <Itenary <T> >();
var cur = dest;
while (cur != source)
{
res.Push(cur);
if (!path.ContainsKey(cur))
{
res.Clear();
return(res);
}
cur = path[cur];
}
res.Push(source);
return(res);
}