LinkedList Sum#9898

LinkedList Sum

1 second

128 megabytes

Very easy

Given a linked list, find the sum of its elements.

Definition of a single linked list:

// Java
class ListNode {
  int val;
  ListNode next;
  ListNode(int x) {
    val = x;
    next = null;
  }
}

Java

// C++
class ListNode
{
public:
  int val;
  ListNode *next;
  ListNode(int x) : val(x), next(NULL) {}
};

C++

// C
struct ListNode
{
  int val;
  struct ListNode *next;
};

Implement function sum that finds the sum of linked list elements.

// Java
int sum(ListNode head)

// C, C++
int sum(ListNode *head)

Note

The sum of elements of a linked list is $6$ .