Create add-two-numbers.py

leetCode/LinkedList/add-two-numbers.py

@@ -0,0 +1,40 @@
+# https://leetcode.com/problems/add-two-numbers/
+# 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]:
+        carry = 0
+        resp = ListNode(0)
+        it = resp
+        while l1 and l2:
+            it.next = ListNode(0)
+            it = it.next
+            it.val = carry + l1.val + l2.val
+            carry = it.val // 10
+            it.val %= 10
+            l1 = l1.next
+            l2 = l2.next
+
+        while l1:
+            it.next = ListNode(0)
+            it = it.next
+            it.val = carry + l1.val
+            carry = it.val // 10
+            it.val %= 10
+            l1 = l1.next
+
+        while l2:
+            it.next = ListNode(0)
+            it = it.next
+            it.val = carry + l2.val
+            carry = it.val // 10
+            it.val %= 10
+            l2 = l2.next
+
+        if carry > 0:
+            it.next = ListNode(carry)
+
+        return resp.next