Create convert-binary-number-in-a-linked-list-to-integer.py

Author: kamyu104

Python/convert-binary-number-in-a-linked-list-to-integer.py

@@ -0,0 +1,21 @@
+# Time:  O(n)
+# Space: O(1)
+
+# Definition for singly-linked list.
+class ListNode(object):
+    def __init__(self, x):
+        self.val = x
+        self.next = None
+
+
+class Solution(object):
+    def getDecimalValue(self, head):
+        """
+        :type head: ListNode
+        :rtype: int
+        """
+        result = 0
+        while head: 
+            result = result*2 + head.val 
+            head = head.next 
+        return result