Problems
LinkedList Sum
LinkedList Sum
Given a linked list, find the sum of its elements.
Definition of a single linked list:
\begin{lstlisting}[language=Java]
// Java
class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
next = null;
}
}
\end{lstlisting}
\begin{lstlisting}[language=C++]
// C++
class ListNode
{
public:
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
\end{lstlisting}
\begin{lstlisting}[language=C]
// C
struct ListNode
{
int val;
struct ListNode *next;
};
\end{lstlisting}
Implement function \textbf{sum} that finds the sum of linked list elements.
\begin{lstlisting}[language=Java]
// Java
int sum(ListNode head)
\end{lstlisting}
\begin{lstlisting}[language=C++]
// C, C++
int sum(ListNode *head)
\end{lstlisting}
\Note
\includegraphics{https://static.e-olymp.com/content/f3/f3bb2da52a69ad6747cf93b8ecf5e0cc95c92441.gif}
The sum of elements of a linked list is $6$.