LinkedList Сумма - Задачи

Какого вида класс должен быть на Python?

int sum(ListNode *head){ if(head->next == NULL){ return head->val; } return head->val+sum(head->next); }

int sum(ListNode *head) { int result = 0; while (head != NULL) { result += head->val; head = head->next; } return result; }

QaziCat

int sum(ListNode *head) { int result = 0; while (head != NULL) { result += head->val; head = head->next; } return result; }

kazim_255

//https://www.e-olymp.com/ru/problems/9898 int sum(ListNode *head) { int ans = head->val; head = head->next; while(head != NULL) { ans += head->val; head = head->next; } return ans; }