// wyznaczenie kolejnosci topologicznej
static public int[] topOrder(CGraph G)
{
int[] LP = new int[G.n + 1];
int[] ORD = new int[G.n + 1];
for (int i = 1; i <= G.n; i++)
{
LP[i] = G.pred(i).Count;
}
Queue <int> Q = new Queue <int>();
for (int i = 1; i <= G.n; i++)
{
if (LP[i] == 0)
{
Q.Enqueue(i);
}
}
int l = 0;
while (Q.Count > 0)
{
int w = Q.Dequeue();
ORD[++l] = w;
foreach (int ns in G.succ(w))
{
if (--LP[ns] == 0)
{
Q.Enqueue(ns);
}
}
}
if (l < G.n)
{
ORD[0] = -1;
}
else
{
ORD[0] = 0;
}
return(ORD);
}
//////////// ver 2 ////////////
// added methods
static public int[] topOrder2(CGraph G, SetPer pi)
{
int[] LP = new int[G.n + 1];
int[] ORD = new int[G.n + 1];
for (int i = 1; i <= G.n; i++)
{
LP[i] = G.pred(i).Count;
}
// added
for (int i = 1; i <= pi.size; i++)
{
if (pi.pi[i - 1] != 0)
{
LP[pi.pi[i]]++;
}
}
// added
Queue <int> Q = new Queue <int>();
for (int i = 1; i <= G.n; i++)
{
if (LP[i] == 0)
{
Q.Enqueue(i);
}
}
int l = 0;
while (Q.Count > 0)
{
int w = Q.Dequeue();
ORD[++l] = w;
foreach (int ns in G.succ(w))
{
if (--LP[ns] == 0)
{
Q.Enqueue(ns);
}
}
// added
int nsp = pi.pi[pi.ps[w] + 1];
if (nsp != 0)
{
if (--LP[nsp] == 0)
{
Q.Enqueue(nsp);
}
}
// added
}
if (l < G.n)
{
ORD[0] = -1;
}
else
{
ORD[0] = 0;
}
return(ORD);
}
