public List <BinaryTreeNode> LevelOrder()
{
if (_head == null)
{
return(null);
}
Queue961 <BinaryTreeNode> queue = new Queue961 <BinaryTreeNode>();
List <BinaryTreeNode> sequence = new List <BinaryTreeNode>();
queue.enqueue(_head);
while (!queue.isEmpty())
{
var node = queue.dequeue();
if (node.leftChildNode != null)
{
queue.enqueue(node.leftChildNode);
}
if (node.rightChildNode != null)
{
queue.enqueue(node.rightChildNode);
}
sequence.Add(node);
}
return(sequence);
}
protected List <GraphNode> BFS(int nodeidx, int[] visitedflag)
{
if (nodeidx < 0 || nodeidx >= NodesCount || visitedflag[nodeidx] == 1)
{
return(null);
}
Queue961 <int> queue = new Queue961 <int>();
int curidx = nodeidx;
queue.enqueue(curidx);
List <GraphNode> result = new List <GraphNode>();
while (!queue.isEmpty())
{
curidx = queue.dequeue();
if (visitedflag[curidx] == 1)
{
continue;
}
visitedflag[curidx] = 1;
result.Add(_nodesarray[curidx]);
List <int> neighbours = getNeighbourNodes(curidx);
for (int i = 0; i < neighbours.Count; i++)
{
if (visitedflag[neighbours[i]] == 0)
{
queue.enqueue(neighbours[i]);
}
}
}
return(result);
}
public override List <GraphEdge> MiniDistance_BSF(int startidx, int destidx)
{
if (startidx < 0 && startidx >= NodesCount)
{
return(new List <GraphEdge>());
}
if (destidx < 0 && destidx >= NodesCount)
{
return(new List <GraphEdge>());
}
if (startidx == destidx)
{
return(new List <GraphEdge>());
}
Queue.Queue961 <int> queue = new Queue961 <int>();
queue.enqueue(startidx);
int[] visitednodes = new int[NodesCount];
int[] parentpathnodes = new int[NodesCount];
int[] nodedistance = new int[NodesCount];
for (int i = 0; i < NodesCount; i++)
{
nodedistance[i] = int.MaxValue;
visitednodes[i] = 0;
parentpathnodes[i] = -1;
}
visitednodes[startidx] = 1;
nodedistance[startidx] = 0;
while (!queue.isEmpty())
{
var curidx = queue.dequeue();
var neighbourenodes = getNeighbourNodes(curidx);
for (int i = 0; i < neighbourenodes.Count; i++)
{
int nodeidx = neighbourenodes[i];
if (visitednodes[nodeidx] == 0)
{
visitednodes[nodeidx] = 1; //已访问
nodedistance[nodeidx] = nodedistance[curidx] + 1;
parentpathnodes[nodeidx] = curidx;
if (nodeidx == destidx) //找到跳出循环
{
queue.clear();
break;
}
queue.enqueue(nodeidx);
}
}
}
List <GraphEdge> edges = new List <GraphEdge>();
int pathendidx = destidx;
while (parentpathnodes[pathendidx] >= 0)
{
GraphEdge edge = new GraphEdge {
Weights = 1, StartNode = _nodesarray[parentpathnodes[pathendidx]], EndNode = _nodesarray[pathendidx]
};
pathendidx = parentpathnodes[pathendidx];
edges.Insert(0, edge);
}
return(edges);
}
static void testqueue()
{
int maxvals = 200;
int[] vals = new int[maxvals];
for (int i = 1; i < maxvals; i++)
{
vals[i] = i;
}
Queue961 <int> queue = new Queue961 <int>();
//测试插入直至栈满
Console.WriteLine("开始测试压队列:");
for (int i = 1; i < maxvals; i++)
{
bool bsuccess = queue.enqueue(vals[i]);
if (bsuccess)
{
printQueueTop(queue);
}
else
{
Console.WriteLine("");
Console.WriteLine("压栈失败: 当前压队列数{0}，是否队列满{1},当前队列内元素数{2}", i, queue.isFull(), queue.Count());
break;
}
}
//测试弹出直至栈空
Console.WriteLine("开始测试出队列:");
for (int i = 1; i < maxvals / 4; i++)
{
printQueueTop(queue);
int?val = queue.dequeue();
if (val == null)
{
Console.WriteLine("");
Console.WriteLine("弹栈失败: 当前弹队列数{0}，是否队列空{1},当前队列内元素数{2}", i, queue.isEmpty(), queue.Count());
break;
}
}
//测试插入直至栈满
Console.WriteLine("开始测试压队列:");
for (int i = 1; i < maxvals; i++)
{
bool bsuccess = queue.enqueue(vals[i]);
if (bsuccess)
{
printQueueTop(queue);
}
else
{
Console.WriteLine("");
Console.WriteLine("压栈失败: 当前压队列数{0}，是否队列满{1},当前队列内元素数{2}", i, queue.isFull(), queue.Count());
break;
}
}
}
static void printQueueTop(Queue961 <int> queue)
{
Console.Write(String.Format("{0} ", queue.top()));
}
