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class LinkedList

LinkedList Sum

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

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

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



The sum of elements of a linked list is 6.

Time limit 1 second
Memory limit 128 MiB
Author Mykhailo Medvediev