Problems
LinkedList Delete first element
LinkedList Delete first element
Given a linked list. Delete the first appearance of the given integer.
Definition of a single linked list:
// Java
class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
next = null;
}
}
// C++
class ListNode
{
public:
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
// C
struct ListNode
{
int val;
struct ListNode *next;
};
Implement a function DeleteFirstElement that deletes the first appearance of element. If element is not in a list, do nothing. Function DeleteFirstElement must return the pointer to the head of updated list.
// Java
ListNode DeleteFirstElement(ListNode head, int element)
// C, C++
ListNode* DeleteFirstElement(ListNode* head, int element)
Example
Let's delete element = 2. Function DeleteFirstElement returns the pointer to the head of updated list: