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* 当要删除的结点z是叶子结点的时候,可以直接删除(判断z的左右指针是否为空,若均为空则直接删除结点z)
*
当要删除的结点z只有左子树(右子树)的时候,将z的左子树(右子树)的结点与z进行互换(若该结点的左指针(右指针)不为空,则将左子树(右子树)的data值赋给z的data)
*
当要删除的结点z既有左子树,又有右子树时,令z的中序遍历的直接后继(直接前驱)替代z,也就是找到z的右子树(左子树)中值最小(最大)的结点与其进行替代,然后从二叉排序树中删去这个直接后继(前驱)结点,这样就转换成了第一或者第二种情况。
以下是第三种情况的一个举例
代码 typedef int elem; typedef struct tree{ int data; struct tree *left,*right;
}tree; tree BST_delete(tree &T,tree E){ tree *p,*q; if (p->left==NULL)
//被删除结点的左孩子为空 { q = p->right; p->data = p->right->data; delete(q); } else if (p
->right==NULL){ //被删除结点的右孩子为空 q = p->left; p->data = p->left->data; delete(q); }
else{ //被删除结点左右子树均存在 q = p->right; int a; //右子树中结点最小的值 p->data = a; BST_delete(T
,q); //此时又回到了前面两种情况,则进行递归 } }