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

Problem:

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

 

-Summary-

1. Save the each node as a string in the num_str variable. 

2. Chang the string into an integer base of 2. (Which is binary number to decimal value)

 

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