Decimal Number From Binary Linked List

easy
1. You are given a linked list with N nodes.
  2. The linked list contains data values as 1 or O only.
  3. You have to write a function that returns the decimal number represented
     by the linked list.
  4. display is a utility function which displays the contents of Linked List,
     feel free to use it for debugging purposes.
  5. main takes input from the users and creates the Linked List. You can use
     display to know its contents.
  6. This is a functional problem. 
  7. You should code only the func function, feel free to change its
     signature if required. It should return the head of the linked list.
  8. Don't change the code of Node, main and display.

Input Format

First line takes N, the number of elements in the list. Next line takes input N space separated numbers 1 or 0. Input is handled for you.

Output Format

The decimal equivalent of the linked list. Output is handled for you.

Constraints

1 <= N <= 30

Notice

Try First, Check Solution later

1. You should first read the question and watch the question video.
2. Think of a solution approach, then try and submit the question on editor tab.
3. We strongly advise you to watch the solution video for prescribed approach.

Example

Input
4
1 1 1 0
Output
14
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