DecimalValue

Published at 2022-03-12

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, val=0, next=None):
#         self.val = val
#         self.next = next
class Solution:
    def getDecimalValue(self, head: ListNode) -> int:
        answer = 0
        while head:
            answer *= 2
            answer += head.val
            head = head.next
        return answer