Leetcode Everyday: 1290. Convert Binary Number in a Linked List to Integer

public class Solution {
    public int GetDecimalValue(ListNode head) {    
        var stack = new Stack<int>();        
        while (head != null) {
            stack.Push(head.val);
            head = head.next;
        }
        
        int n = 1;
        int sum = 0;        
        foreach (var digit in stack) {
            sum += digit * n;
            n *= 2;
        }
        return sum;
    }
}

Source: https://leetcode.com/problems/convert-binary-number-in-a-linked-list-to-integer/