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                # 線索二叉樹 線索二叉樹是二叉樹線索化,實質是在遍歷二叉樹的過程中,檢查當前節點的左右指針域是否為空,若為空,則將它們改為指向前驅節點或后繼節點的線索。 ## 定義 ```C typedef struct node { ElemType data; int ltag, rtag; //增加線索標記,若為1,則表示指向前驅,否則指向孩子 struct node *lchild; struct node *rchild; }TBNode; ``` ## 中序線索二叉樹 ```C TBTNode *pre; void Thread(TBTNode *&p) { if(p!=NULL){ Thread(p->lchild); // 建立當前節點的前驅線索 if(p->lchild==NULL){ p->lchild=pre; p->ltag=1; } else p->ltag=0; // 建立前驅節點的后繼線索 if(pre->rchild==NULL){ pre-rchild=p; pre->rtag=1; } else pre->rtag=0; pre=p; Thread(p->rchild); } } TBTNode *CreaThread(TBTNode *b) { // 創建頭結點 TBTNode *root; root=(TBTNode *)malloc(sizeof(TBTNode)); root->ltag=0; root->rtag=1; root->rchild=b; if(b==NUll) root->lchild=root; else{ root->lchild=b; // pre 是 *p 的前驅節點,供加線索 pre=root; Thread(b); // 最后加入指向頭結點的線索和頭結點線索化 pre->rchild=root; pre->rtag=1; root->rchild=pre; } return root; } ``` ## 遍歷線索二叉樹 ```C void ThInOrder(TBTNode *tb) { TBTNode *p=tb->lchild; while(p!=NULL){ while(p->ltag==0) p=p->lchild; printf("%c", p->data); while(p->rtag==1 && p->rchild!=tb){ p=p->rchild; printf("%c", p->data); } p=p->rchild; } } ```
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