private void Visit(EdgeWeightedGraph G, int v)
{
_marked[v] = true;
foreach (var e in G.Adj(v))
{
var w = e.Other(v);
if (_marked[w])
{
continue;
}
if (_distTo[w] > e.Weight())
{
_edgeTo[w] = e;
_distTo[w] = e.Weight();
if (_pq.Contains(w))
{
_pq.Change(w, e.Weight());
}
else
{
_pq.Insert(w, e.Weight());
}
}
}
}
public SimplePrimMST(EdgeWeightedGraph G)
: base(G)
{
_marked = new bool[G.V()];
_edgeTo = new Edge[G.V()];
_pq = new IndexMinPQ <double>(G.E());
_pq.Insert(0, 0d);
while (!_pq.IsEmpty())
{
int v = _pq.RemoveMin();
Visit(G, v);
}
}
public DijkstraSP(EdgeWeightedDigraph G, int s) : base(G, s)
{
_pq = new IndexMinPQ <double>(G.E());
for (int i = 0; i < G.V(); i++)
{
_distTo[i] = double.PositiveInfinity;
}
_distTo[s] = 0d;
_pq.Insert(0, 0d);
while (!_pq.IsEmpty())
{
var w = _pq.RemoveMin();
Relax(G, w);
}
}
public PrimMST(EdgeWeightedGraph G)
: base(G)
{
_marked = new bool[G.V()];
_edgeTo = new Edge[G.V()];
_distTo = new double[G.V()];
_pq = new IndexMinPQ <double>(G.E());
for (int v = 0; v < G.V(); v++)
{
_distTo[v] = double.PositiveInfinity;
}
_distTo[0] = 0d;
_pq.Insert(0, 0d);
while (!_pq.IsEmpty())
{
int v = _pq.RemoveMin();
Visit(G, v);
}
}
private void Relax(EdgeWeightedDigraph G, int v)
{
foreach (var e in G.Adj(v))
{
var w = e.To();
if (_distTo[w] > _distTo[v] + e.Weight())
{
_distTo[w] = _distTo[v] + e.Weight();
_edgeTo[w] = e;
if (_pq.Contains(w))
{
_pq.Change(w, _distTo[w]);
}
else
{
_pq.Insert(w, _distTo[w]);
}
}
}
}
