二叉排序树

typedef struct node
{
    int data;
    struct node *lchild, *rchild;
}bitnode, *bitree;

bool search(bitree T, int x, bitree f, bitree *p){ // 查找应该插入的位置
    if (!T) {
        *p = f;
        return false;
    }
    else if (T->data == x){
        *p = T;
        return true;
    }
    else if (T->data > x) return search(T->lchild, x, T, p);
    else return search(T->rchild, x, T, p);
}

bool creat(bitree *T, int x){   // 创建一棵二叉排序树
    bitree p, s;
    if (search(*T, x, NULL, &p)) return false;
    else {
        s = (bitnode *)malloc(sizeof(bitnode));
        s->data = x;
        s->lchild = s->rchild = NULL;
        
        if (!p) *T = s;
        else if (x < p->data) p->lchild = s;
        else p->rchild = s;
        return true;
    } 
}

void delet(bitree *T){
    if ((*T)->lchild == NULL && (*T)->rchild == NULL) (*T) = NULL;
    else if ((*T)->lchild == NULL) (*T) = (*T)->rchild;
    else if ((*T)->rchild == NULL) (*T) = (*T)->lchild;
    else {
        bitree L = (*T)->lchild;
        while(L->rchild){
            L = L->rchild;
        }
        L->rchild = (*T)->rchild;
        (*T) = (*T)->lchild;
    }
}

void deletbit(bitree *T, int x){
    if (!(*T)) return;
    else if ((*T)->data == x) {
        delet(T);
        return; 
    }
    else if ((*T)->data > x) deletbit(&(*T)->lchild, x);
    else deletbit(&(*T)->rchild, x);
}