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: