class Vertex
{
// for all i in [0..next.length-1]
// there is an edge from `this` to `next[i]`
Vertex[] next;
int mark;
static bool HasCycle(Vertex[] vertices)
{
bool Inner(Vertex v)
{
if (v.mark == 1) return true;
v.mark = 1;
foreach (var n in v.next)
if (Inner(n)) return true;
v.mark = 0;
return false;
}
try
{
foreach (var v in vertices)
if (Inner(v)) return true;
}
finally
{
foreach (var v in vertices)
v.mark = 0; //clear marks for purity
}
return false;
}
}
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