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計(jì)算廣義表原子結(jié)點(diǎn)個(gè)數(shù)

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public int CountAtom() {return CountAtom(_Root); }public int CountAtom(GLNode<char> node) {int i = 0;if (node != null){switch (node.Type){case NodeType.Atom:i++;break;case NodeType.List:i+=CountAtom(node.Item as GLNode<char>);break;}return i + CountAtom(node.Next);}return 0; }

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替換相同原子

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public void Replace(char oldchar, char newchar) {Replace(_Root, oldchar, newchar); }public void Replace(GLNode<char> node,char oldchar,char newchar) {if (node != null){switch (node.Type){case NodeType.Atom:if ((char)node.Item == oldchar)node.Item = newchar;break;case NodeType.List:Replace(node.Item as GLNode<char>, oldchar, newchar);break;}Replace(node.Next,oldchar,newchar);} }

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刪除相同原子

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public GLNode<char> DeleteAtom(char key) {return DeleteAtom(_Root, key); }public GLNode<char> DeleteAtom(GLNode<char> node, char key) {GLNode<char> current = node;if (current != null){switch (current.Type){case NodeType.Atom:if ((char) current.Item == key)return DeleteAtom(current.Next, key);break;case NodeType.List:DeleteAtom(current.Item as GLNode<char>, key);break;}current.Next = DeleteAtom(current.Next, key);_Root = current;return current;}return null; }

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廣義表逆置

將頭與尾交換,如a,b,c

則a與b,c;b與c交換,也是一個(gè)遞歸過(guò)程從尾交換開始,

public GLNode<char> Reverse(GLNode<char> node) {if (IsEmpty(node)) return null;switch (node.Type){case NodeType.Atom:if (node.Next != null)node = Append(Reverse(GetTail(node)), GetHead(node));break;case NodeType.List:node = Append(Reverse(GetTail(node)), new GLNode<char>() { Item = Reverse((GLNode<char>)node.Item), Type = NodeType.List });break;}return node; }public GLNode<char> Append(GLNode<char> head, GLNode<char> tail) {if (IsEmpty(head)) return tail;var pre = head;var cur = head.Next;while (cur != null){pre = cur;cur = cur.Next;}pre.Next = tail;return head; }

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判斷兩個(gè)廣義表是否完全相等

轉(zhuǎn)載于:https://www.cnblogs.com/Clingingboy/archive/2011/01/22/1942009.html

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