02 Add Two Numbers.py

Author: teter-tech

02 Add Two Numbers.py

@@ -0,0 +1,28 @@
+# Definition for singly-linked list.
+# class ListNode:
+#     def __init__(self, val=0, next=None):
+#         self.val = val
+#         self.next = next
+class Solution:
+    def addTwoNumbers(self, l1: Optional[ListNode], l2: Optional[ListNode]) -> Optional[ListNode]:
+        dummy=ListNode()
+        curr=dummy
+
+        carry=0
+        while l1 or l2 or carry:
+            v1=l1.val if l1 else 0
+            v2=l2.val if l2 else 0
+            # new digits
+
+            val=v1+v2+carry;
+            # 23
+            carry=val//10
+            val=val%10
+
+            curr.next=ListNode(val)
+            # update the ptrs
+            curr=curr.next
+            l1=l1.next if l1 else None
+            l2=l2.next if l2 else None
+        return dummy.next
+