private void dfs(EdgeWeightedDigraph G, int v)
{
pre.Enqueue(v);
marked[v] = true;
foreach (var w in G.Adj(v))
if (!marked[w.from])
dfs(G, w.from);
post.Enqueue(v);
reversePost.Push(v);
}
//若 顶点v在一个环中，那么一次深搜可以找到该环
private void Dfs(EdgeWeightedDigraph g, int v)
{
_onStack[v] = true;
_marked[v] = true;
foreach (var e in g.Adj(v))
{
if (HasCycle())
{
return;
}
else if (!_marked[e.To])
{
_edgeTo[e.To] = e;
Dfs(g, e.To);
}
//如果遍历到一个已经访问过到点，那么就是有环了
else if (_onStack[e.To])
{
_cycle = new Stack <DirectedEdge>();
var f = e;
while (f.From != e.To)
{
_cycle.Push(f);
f = _edgeTo[f.From];
}
_cycle.Push(f);
}
}
_onStack[v] = false;
}
private void dfs(EdgeWeightedDigraph G, int v)
{
onStack[v] = true;
marked[v] = true;
foreach (var w in G.Adj(v))
{
if (this.hasCycle())
{
return;
}
else if (!marked[w.to])
{
edgeTo[w.to] = v;
dfs(G, w.to);
}
else if (onStack[w.to])
{
cycle = new Stack <DirectedEdge>();
for (int x = v; x != w.to; x = edgeTo[x])
{
//cycle.Push(x);
cycle.Push(w);
}
//cycle.Push(v);
}
}
onStack[v] = false;
}
private void relax(EdgeWeightedDigraph G, int v)
{
foreach (DirectedEdge e in G.Adj(v))
{
int w = e.to;
if (distTo[w] > distTo[v] + e.Weight)
{
distTo[w] = distTo[v] + e.Weight;
edgeTo[w] = e;
}
}
}
private void relax(EdgeWeightedDigraph G, int v)
{
foreach (DirectedEdge e in G.Adj(v))
{
int w = e.to;
if (distTo[w] > distTo[v] + e.Weight)
{
distTo[w] = distTo[v] + e.Weight;
edgeTo[w] = e;
}
}
}
private void dfs(EdgeWeightedDigraph G, int v)
{
pre.Enqueue(v);
marked[v] = true;
foreach (var w in G.Adj(v))
{
if (!marked[w.from])
{
dfs(G, w.from);
}
}
post.Enqueue(v);
reversePost.Push(v);
}
private void Dfs(EdgeWeightedDigraph dg, int v)
{
preQueue.Enqueue(v);
marked[v] = true;
foreach (var e in dg.Adj(v))
{
int w = e.To;
if (!marked[w])
{
Dfs(dg, w);
}
}
postQueue.Enqueue(v);
reversePost.Push(v);
}
public void Relax(EdgeWeightedDigraph g, int v)
{
foreach (DirectedEdge e in g.Adj(v))
{
int 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]);
}
}
}
}
private void relax(EdgeWeightedDigraph G, int v)
{
foreach (DirectedEdge e in G.Adj(v))
{
int 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]);
}
}
}
}
private void relax(EdgeWeightedDigraph G, int v)
{
foreach (DirectedEdge e in G.Adj(v))
{
int w = e.to;
if (distTo[w] > distTo[v] + e.Weight)
{
distTo[w] = distTo[v] + e.Weight;
edgeTo[w] = e;
if (!onQ[w])
{
queue.Enqueue(w);
onQ[w] = true;
}
}
if (cost++ % G.V == 0)
{
findNegativeCycle();
}
}
}
private void Relax(EdgeWeightedDigraph g, int v)
{
foreach (var e in g.Adj(v))
{
int w = e.To;
if (_distTo[w] > _distTo[v] + e.Weight)
{
_distTo[w] = _distTo[v] + e.Weight;
_edgeTo[w] = e;
if (!_onQueue[w])
{
_queue.Enqueue(w);
_onQueue[w] = true;
}
}
if (_cost++ % g.V == 0)
{
FindNegativeCycle();
}
}
}
private void dfs(EdgeWeightedDigraph G, int v)
{
onStack[v] = true;
marked[v] = true;
foreach (var w in G.Adj(v))
if (this.hasCycle())
return;
else if (!marked[w.to])
{
edgeTo[w.to] = v;
dfs(G, w.to);
}
else if (onStack[w.to])
{
cycle = new Stack<DirectedEdge>();
for (int x = v; x != w.to; x = edgeTo[x])
//cycle.Push(x);
cycle.Push(w);
//cycle.Push(v);
}
onStack[v] = false;
}
private void relax(EdgeWeightedDigraph G, int v)
{
foreach (DirectedEdge e in G.Adj(v))
{
int w = e.to;
if (distTo[w] > distTo[v] + e.Weight)
{
distTo[w] = distTo[v] + e.Weight;
edgeTo[w] = e;
if (!onQ[w])
{
queue.Enqueue(w);
onQ[w] = true;
}
}
if (cost++%G.V == 0)
findNegativeCycle();
}
}
private void relax(EdgeWeightedDigraph G, int v)
{
foreach (DirectedEdge e in G.Adj(v))
{
int 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]);
}
}
}