PHP如何实现自排序二叉树-创新互联
这篇文章将为大家详细讲解有关PHP如何实现自排序二叉树,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
创新互联主营禅城网站建设的网络公司,主营网站建设方案,成都app软件开发公司,禅城h5成都小程序开发搭建,禅城网站营销推广欢迎禅城等地区企业咨询在节点之间再应用一些排序逻辑,二叉树就能提供出色的组织方式。对于每个节点,都让满足所有特定条件的元素都位于左节点及其子节点。在插入新元素时,我们需要从树的第一个节 点(根节点)开始,判断它属于哪一侧的节点,然后沿着这一侧找到恰当的位置,类似地,在读取数据时,只需要使用按序遍历方法来遍历二叉树。
复制代码 代码如下:
ob_start();
// Here we need to include the binary tree class
Class Binary_Tree_Node() {
// You can find the details at
}
ob_end_clean();
// Define a class to implement self sorting binary tree
class Sorting_Tree {
// Define the variable to hold our tree:
public $tree;
// We need a method that will allow for inserts that automatically place
// themselves in the proper order in the tree
public function insert($val) {
// Handle the first case:
if (!(isset($this->tree))) {
$this->tree = new Binary_Tree_Node($val);
} else {
// In all other cases:
// Start a pointer that looks at the current tree top:
$pointer = $this->tree;
// Iteratively search the tree for the right place:
for(;;) {
// If this value is less than, or equal to the current data:
if ($val <= $pointer->data) {
// We are looking to the left ... If the child exists:
if ($pointer->left) {
// Traverse deeper:
$pointer = $pointer->left;
} else {
// Found the new spot: insert the new element here:
$pointer->left = new Binary_Tree_Node($val);
break;
}
} else {
// We are looking to the right ... If the child exists:
if ($pointer->right) {
// Traverse deeper:
$pointer = $pointer->right;
} else {
// Found the new spot: insert the new element here:
$pointer->right = new Binary_Tree_Node($val);
break;
}
}
}
}
}
// Now create a method to return the sorted values of this tree.
// All it entails is using the in-order traversal, which will now
// give us the proper sorted order.
public function returnSorted() {
return $this->tree->traverseInorder();
}
}
// Declare a new sorting tree:
$sort_as_you_go = new Sorting_Tree();
// Let's randomly create 20 numbers, inserting them as we go:
for ($i = 0; $i < 20; $i++) {
$sort_as_you_go->insert(rand(1,100));
}
// Now echo the tree out, using in-order traversal, and it will be sorted:
// Example: 1, 2, 11, 18, 22, 26, 32, 32, 34, 43, 46, 47, 47, 53, 60, 71,
// 75, 84, 86, 90
echo '
', implode(', ', $sort_as_you_go->returnSorted()), '
';?>
关于“PHP如何实现自排序二叉树”这篇文章就分享到这里了,希望以上内容可以对大家有一定的帮助,使各位可以学到更多知识,如果觉得文章不错,请把它分享出去让更多的人看到。
本文名称:PHP如何实现自排序二叉树-创新互联
链接分享:http://scyanting.com/article/phisd.html