// FIXME: how to join these two functions into one?
void set_of_doubles_to_string (rbtree *t, strbuf *out, unsigned limit)
{
unsigned doubles_cnt=rbtree_count(t);
if (doubles_cnt<limit)
{
rbtree_node *max=rbtree_maximum(t);
for (rbtree_node *j=rbtree_minimum(t); j; j=rbtree_succ(j))
{
strbuf_addf (out, "%.1f", *(double*)j->key);
if (j!=max)
strbuf_addstr (out, ", ");
};
}
else
{
unsigned chunk_size=limit/2;
int i;
rbtree_node *j;
for (i=0, j=rbtree_minimum(t); i<chunk_size; j=rbtree_succ(j), i++)
{
strbuf_addf (out, "%.1f", *(double*)j->key);
if (i+1 != chunk_size)
strbuf_addstr (out, ", ");
};
strbuf_addf (out, " (%d doubles skipped) ", doubles_cnt - chunk_size*2);
rbtree_node *n=rbtree_maximum(t);
for (int i=0; i<(chunk_size-1); i++)
n=rbtree_pred(n);
for (int i=0; i<chunk_size; n=rbtree_succ(n), i++)
{
strbuf_addf (out, "%.1f", *(double*)n->key);
if (i+1 != chunk_size)
strbuf_addstr (out, ", ");
};
};
};
int
main(void)
{
//int i;
RB_TREE *T;
T = tree_init();
node_insert(T, 23);
node_insert(T, 94);
node_insert(T, 32);
node_insert(T, 84);
node_insert(T, 12);
node_insert(T, 8);
node_insert(T, 82);
node_insert(T, 31);
node_insert(T, 59);
node_insert(T, 41);
node_insert(T, 73);
//for ( i = 0 ; i < 1000 ; i++ ) {
// key = rand() % 1000;
// node_insert(T, key);
//}
inorder_tree_walk(T, T->root);
printf("\n");
node_delete(T, 32);
node_delete(T, 8);
node_delete(T, 4);
printf("after delete 32, 8, 4:\n");
inorder_tree_walk(T, T->root);
printf("\n");
printf("sucessor of 23 is %d\n", rbtree_successor(T, rbtree_search(T, T->root, 23))->key);
printf("predecessor of 84 is %d\n", rbtree_predecessor(T, rbtree_search(T, T->root, 84))->key);
printf("the maximun is %d\n", rbtree_maximum(T, T->root)->key);
printf("the minimum is %d\n", rbtree_minimum(T, T->root)->key);
node_destory(T, T->root);
tree_destory(T);
exit(0);
}
void set_of_string_to_string (rbtree *t, strbuf *out, unsigned limit)
{
unsigned strings_cnt=rbtree_count(t);
unsigned strings_dumped=0;
rbtree_node *max=rbtree_maximum(t);
for (rbtree_node *j=rbtree_minimum(t); j; j=rbtree_succ(j))
{
strbuf_addstr (out, (char*)j->key);
if (strings_dumped++>limit)
{
strbuf_addf (out, " (%d strings skipped)", strings_cnt - strings_dumped);
break;
};
if (j!=max)
strbuf_addstr (out, ", ");
};
};
RB_NODE *
rbtree_predecessor(RB_TREE *T, RB_NODE *x)
{
/*
* 查找先驱，与tree_successor对称
*/
RB_NODE *y;
y = node_init(T);
if (x->left != T->nil)
return rbtree_maximum(T, x->left);
y = x->parent;
while (y != T->nil && x == y->left) {
x = y;
y = y->parent;
}
return(y);
}
