Sum values in a simple linked list 1→2→3.
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using System;
class Node { public int Val; public Node Next; public Node(int v) => Val = v; }
class Program {
static void Main() {
var head = new Node(1) { Next = new Node(2) { Next = new Node(3) } };
int sum = 0; for (var cur = head; cur != null; cur = cur.Next) sum += cur.Val;
Console.WriteLine(sum);
}
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Traverse linked list with Next pointer.
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