public override void Execute(Instance instance)
{
if ( !(instance is SMInstance)) {
this.result = new SMResult("Type mismatch");
return;
}
SMInstance smi = (SMInstance)instance;
int n = smi.Size;
int[] mMatch = new int[n];
int[] mProposals = new int[n];
int[] wMatch = new int[n];
Stack<int> unmatched = new Stack<int>(n);
for (int i = 0; i < n; i++) {
mMatch[i] = -1;
unmatched.Push(i);
mProposals[i] = 0;
wMatch[i] = -1;
}
while (unmatched.Count > 0) {
int m = unmatched.Pop();
int w = smi.MPrefMatrix[m][mProposals[m]];
mProposals[m]++;
if (wMatch[w] == -1) {
mMatch[m] = w;
wMatch[w] = m;
}
else {
int m1 = wMatch[w];
if (smi.WRankMatrix[w][m] < smi.WRankMatrix[w][m1]) {
mMatch[m] = w;
wMatch[w] = m;
mMatch[m1] = -1;
unmatched.Push(m1);
}
else {
unmatched.Push(m);
}
}
}
this.result = new SMResult(mMatch, wMatch, smi);
}
public static IEnumerable<Vertex> DepthFirstGraphTraversal(
this IGraph graph,
Vertex source)
{
Stack<Vertex> toVisit = new Stack<Vertex>();
toVisit.Push(source);
while (toVisit.Count > 0)
{
Vertex v = toVisit.Pop();
yield return v;
foreach (Vertex w in graph.Neighbors(v))
{
toVisit.Push(w);
}
}
}
public static IEnumerable<Vertex> PreOrderTreeTraversal(
this IGraph graph,
Vertex source)
{
Stack<Vertex> toVisit = new Stack<Vertex>();
HashSet<Vertex> visited = new HashSet<Vertex>();
toVisit.Push(source);
visited.Add(source);
while (toVisit.Count > 0)
{
Vertex v = toVisit.Pop();
yield return v;
foreach (Vertex w in graph.Neighbors(v))
{
if (!visited.Contains(w))
{
toVisit.Push(w);
visited.Add(w);
}
}
}
}
public void PrintInOrderNonRecursive()
{
if (root == null) return;
Console.WriteLine("In-order traversal (non recursive):");
Stack<Node> st = new Stack<Node>();
// add the whole left-most path to stack
Node p = root;
while (p != null)
{
st.Push(p);
p = p.left;
}
while (st.Count > 0)
{
Node top = st.Pop();
Console.Write("{0}, ", top.val);
if (top.right != null)
{
// add another left-most path
p = top.right;
while (p != null)
{
st.Push(p);
p = p.left;
}
}
}
Console.WriteLine();
}
