數據結構與算法(C#實現)系列---N叉樹(二)

Heavenkiller(原創)

public override uint Degree

         {

              get

              {

                   return this.degree;

              }

         }
                     

         //只用于空樹結點

         public virtual void AttachKey(object _obj)

         {

              if(!IsEmpty())

                   throw new Exception("My:this node must be a empty tree node!");

              this.key=_obj;

              this.treeList=new ArrayList();//產生一個degree長的數組,并將其初始化為空樹

              this.treeList.Capacity=(int)this.degree;

              for(int i=0;i<this.degree;i++)

              {

                   treeList.Add(new NaryTree(this.degree));

              }

              /*

              foreach(object tmpObj in this.treeList)

              {

                   tmpObj=new NaryTree(this.degree);

              }

              */

         }

         //只用于葉子結點，將葉子結點變為一個空結點，并返回葉子結點關鍵字的引用

         public virtual object DetachKey()

         {

              if(!IsLeaf())

                   throw new Exception("My:this node must be a leaf node!");

              object result=this.key;//store this leaf node temporary

              this.key=null;

              this.treeList=null;

              return result;

         }

         //將子樹連接到指定樹的第num個結點上，前提是這個結點必須是空結點,并且度數相同，否則拋出異常

         public virtual void AttachSubtree(uint num,NaryTree _naryTree)

         {

              if(this.IsEmpty())

                   throw new Exception("My:it can't be a empty tree!");

              if(!(this[num-1].IsEmpty()) this.degree!=_naryTree.degree )

                   throw new Exception("My:this[i-1] must be empty and they should have the same degree!");

              this[num-1]=_naryTree;

         }

         //僅為非空樹定義，從給定樹中刪去它的第i棵子樹并連上一個空樹,度數相同，并且返回刪除的子樹引用

         public virtual NaryTree DetachSubtree(uint num)

         {

              if (IsEmpty())

                   throw new Exception("My:it can't be empty! ");

              NaryTree tmpTree=this;

              ((NaryTree)this[num-1]).key=null;

              ((NaryTree)this[num-1]).treeList=null;

              return this;

         }

     }

}