Convert Binary Number in a Linked List to Integer - LeetCode 1290

 Given head which is a reference node to a singly-linked list. The value of each node in the linked list is either 0 or 1. The linked list holds the binary representation of a number.

Return the decimal value of the number in the linked list.

 

Example 1:

Input: head = [1,0,1]
Output: 5
Explanation: (101) in base 2 = (5) in base 10

Example 2:

Input: head = [0]
Output: 0

Example 3:

Input: head = [1]
Output: 1

Example 4:

Input: head = [1,0,0,1,0,0,1,1,1,0,0,0,0,0,0]
Output: 18880

Example 5:

Input: head = [0,0]
Output: 0

 

Solutions(Only function):

class Solution {

    public int getDecimalValue(ListNode head) {    

        int num=0;

        while(head!=null)

        {

            num=num*2+head.val;

            head=head.next;

        }

        return num;

    }

}