diff options
Diffstat (limited to 'convert_bin_ll_int.py')
-rw-r--r-- | convert_bin_ll_int.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/convert_bin_ll_int.py b/convert_bin_ll_int.py new file mode 100644 index 0000000..316dd4b --- /dev/null +++ b/convert_bin_ll_int.py @@ -0,0 +1,36 @@ +# 1290. Convert Binary Number in a Linked List to Integer + +""" +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. the most significant bit is at the head of the linked list. +""" + + +# Definition for singly-linked list. +class ListNode(object): + def __init__(self, val=0, next=None): + self.val = val + self.next = next + + +class Solution(object): + def getDecimalValue(self, head): + """ + :type head: Optional[ListNode] + :rtype: int + """ + ans = 0 + while head: + ans = 2 * ans + head.val + head = head.next + return ans + + +if __name__ == "__main__": + obj = Solution() + h1 = ListNode(1, ListNode(0, ListNode(1))) + h2 = ListNode(0) + print(obj.getDecimalValue(h1)) + print(obj.getDecimalValue(h2)) |