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Delete a node from a singly-linked list, given only a variable pointing to that node.
The input could, for example, be the variable $b below:
class LinkedListNode
{
private $value;
private $next = null;
public function __construct($value)
{
$this->value = $value;
}
public function getNext()
{
return $this->next;
}
public function setNext($next)
{
$this->next = $next;
}
public function getValue()
{
return $this->value;
}
public function setValue($value)
{
$this->value = $value;
}
}
$a = new LinkedListNode('A');
$b = new LinkedListNode('B');
$c = new LinkedListNode('C');
$a->setNext($b);
$b->setNext($c);
deleteNode($b);
We can do this in time and space! But our answer is tricky, and it could have some side effects...
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