//改变v1到v2弧的权值
public bool ChangeEdgeWei(Node <T> v1, Node <T> v2, int v)
{
//v1或v2不是图的顶点或者v1和v2之间不存在边
if (!IsNode(v1) || !IsNode(v2) || !IsEdge(v1, v2))
{
//Console.WriteLine("Node is not belong to Graph!");
return(false);
}
//权值不对
if (v < 1)
{
//Console.WriteLine("Weight is not right!");
return(false);
}
//处理顶点v1的邻接表
adjListNode <T> p = adjList[GetIndex(v1)].FirstAdj;
while (p.Adjvex != GetIndex(v2))
{
p = p.Next;
}
p.Weight = v;
return(true);
}
//在顶点v1和v2之间添加权值为v的弧
public bool SetEdge(Node <T> v1, Node <T> v2, int v)
{
//v1或v2不是图的顶点或者v1和v2之间存在边
if (!IsNode(v1) || !IsNode(v2) || IsEdge(v1, v2))
{
//Console.WriteLine("Node is not belong to Graph!");
return(false);
}
//权值不对
if (v < 1)
{
//Console.WriteLine("Weight is not right!");
return(false);
}
//处理顶点v1的邻接表
adjListNode <T> p = new adjListNode <T>(GetIndex(v2), v);
if (adjList[GetIndex(v1)].FirstAdj == null)//顶点v1无邻接顶点
{
adjList[GetIndex(v1)].FirstAdj = p;
adjList[GetIndex(v1)].Outdegree++;
adjList[GetIndex(v2)].Indegree++;
}
else//顶点v1有邻接顶点
{
p.Next = adjList[GetIndex(v1)].FirstAdj;
adjList[GetIndex(v1)].FirstAdj = p; //头插法
adjList[GetIndex(v1)].Outdegree++;
adjList[GetIndex(v2)].Indegree++;
}
return(true);
}
//构造器
public GraphAdjList(GraphAdjList <T> newGraph)
{
adjList = new VexNode <T> [newGraph.GetNumOfVertex()];
adjListNode <T> pre, p;
for (int i = 0; i < newGraph.GetNumOfVertex(); ++i)
{
adjList[i] = new VexNode <T>();
adjList[i].Data = new Node <T>(newGraph.adjList[i].Data.Data);
adjList[i].Indegree = newGraph.adjList[i].Indegree;
adjList[i].Outdegree = newGraph.adjList[i].Outdegree;
if (newGraph.adjList[i].FirstAdj == null)
{
adjList[i].FirstAdj = null;
}
else
{
adjListNode <T> GraphP = newGraph.adjList[i].FirstAdj;
pre = new adjListNode <T>(GraphP.Adjvex, GraphP.Weight);
adjList[i].FirstAdj = pre;
while (GraphP.Next != null)
{
p = new adjListNode <T>(GraphP.Next.Adjvex, GraphP.Next.Weight);
pre.Next = p;
pre = p;
GraphP = GraphP.Next;
}
pre.Next = GraphP.Next;//null
}
}
}
//判断v1到v2是否存在弧
public bool IsEdge(Node <T> v1, Node <T> v2)
{
if (adjList == null)
{
return(false);
}
//v1或v2不是图的顶点
if (!IsNode(v1) || !IsNode(v2))
{
//Console.WriteLine("Node is not belong to Graph!");
return(false);
}
adjListNode <T> p = adjList[GetIndex(v1)].FirstAdj;
while (p != null)
{
if (p.Adjvex == GetIndex(v2))
{
return(true);
}
p = p.Next;
}
return(false);
}
//构造器
public VexNode(Node <T> nd, adjListNode <T> alNode)
{
data = nd;
firstAdj = alNode;
indegree = 0;
outdegree = 0;
}
//构造器
public VexNode(Node <T> nd)
{
data = nd;
firstAdj = null;
indegree = 0;
outdegree = 0;
}
//构造器
public VexNode()
{
data = null;
firstAdj = null;
indegree = 0;
outdegree = 0;
}
//删除顶点v1和v2之间的边
public bool DelEdge(Node <T> v1, Node <T> v2)
{
//v1或v2不是图的顶点
if (!IsNode(v1) || !IsNode(v2))
{
//Console.WriteLine("Node is not belong to Graph!");
return(false);
}
//顶点v1到v2到有弧
if (IsEdge(v1, v2))
{
//处理顶点v1的邻接表中的顶点v2的邻接表结点
adjListNode <T> p = adjList[GetIndex(v1)].FirstAdj;
adjListNode <T> pre = null; //被删除的前一项
//firstAdj就是v2
if (p.Adjvex == GetIndex(v2))
{
adjList[GetIndex(v1)].FirstAdj = p.Next;
}
else
{
while (p != null)
{
if (p.Adjvex != GetIndex(v2))
{
pre = p;
p = p.Next;
}
else
{
pre.Next = p.Next;
p = p.Next;
}
}
}
adjList[GetIndex(v1)].Outdegree--;
adjList[GetIndex(v2)].Indegree--;
}
return(true);
}
//获取弧的数目
public int GetNumOfEdge()
{
if (adjList == null)
{
return(0);
}
int i = 0;
foreach (VexNode <T> nd in adjList) //以nd为弧尾
{
adjListNode <T> p = nd.FirstAdj; //以p为弧头
while (p != null)
{
++i;
p = p.Next;
}
}
return(i);//有向图
//return i / 2;//无向图
}
//删除顶点
public bool DelNode(Node <T> v)
{
//v不在图中
if (!IsNode(v))
{
//Console.WriteLine("Node isn't belong to Graph!");
return(false);
}
int index = this.GetIndex(v);
//修改原表，删除有关v的边
for (int i = 0; i < adjList.Length; i++)
{
if (i == index)
{
continue;
}
//从adjlist[i]到v有弧
if (IsEdge(adjList[i].Data, v))
{
DelEdge(adjList[i].Data, v);
}
//从v到adjlist[i]有弧
if (IsEdge(v, adjList[i].Data))
{
DelEdge(v, adjList[i].Data);
}
}
VexNode <T>[] oldAdjList = adjList;
adjList = new VexNode <T> [adjList.Length - 1];
//原表复制
for (int i = 0; i < index; i++)
{
adjList[i] = new VexNode <T>();
adjList[i].Data = oldAdjList[i].Data;
adjList[i].FirstAdj = oldAdjList[i].FirstAdj;
adjList[i].Indegree = oldAdjList[i].Indegree;
adjList[i].Outdegree = oldAdjList[i].Outdegree;
//修改邻接表
for (adjListNode <T> p = adjList[i].FirstAdj; p != null; p = p.Next)
{
if (p.Adjvex > index)
{
p.Adjvex--; //当p的索引比删掉点的索引大，其值减一
}
}
}
for (int i = index; i < adjList.Length; i++)
{
adjList[i] = new VexNode <T>();
adjList[i].Data = oldAdjList[i + 1].Data;
adjList[i].FirstAdj = oldAdjList[i + 1].FirstAdj;
adjList[i].Indegree = oldAdjList[i + 1].Indegree;
adjList[i].Outdegree = oldAdjList[i + 1].Outdegree;
//修改邻接表
for (adjListNode <T> p = adjList[i].FirstAdj; p != null; p = p.Next)
{
if (p.Adjvex > index)
{
p.Adjvex--; //当p的索引比删掉点的索引大，其值减一
}
}
}
return(true);
}
//构造器
public adjListNode(int vex, int wei)
{
adjvex = vex;
next = null;
weight = wei;
}