Finish problem 0002-add-two-numbers

2026-07-21 21:51:26 -05:00
parent 2476821049
commit def79644a1
2 changed files with 51 additions and 0 deletions
@@ -0,0 +1,21 @@
+class ListNode:
+    def __init__(self, val=0, next=None):
+        self.val = val
+        self.next = next
+
+
+class Solution:
+    def addTwoNumbers(self, l1: ListNode | None, l2: ListNode | None) -> ListNode | None:
+        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
+            digit = (v1 + v2 + carry) % 10
+            carry = (v1 + v2 + carry) // 10
+            curr.next = ListNode(digit)
+            curr = curr.next
+            l1 = l1.next if l1 else None
+            l2 = l2.next if l2 else None
+        return dummy.next